diff --git a/.drone.yml b/.drone.yml
index 3f03ddd5..301df037 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -225,34 +225,42 @@ steps:
   commands:
   - pacman --noconfirm -Syu
   - sudo -u aur yay --noconfirm -S vpv
-
 ---
+
 kind: pipeline
 type: docker
-name: ubuntu-xenial-mkappimage
+name: ubuntu-bionic-mkappimage
 
 steps:
 - name: mkappimage
-  image: ubuntu:xenial
+  image: ubuntu:bionic
   commands:
   - apt-get update
   - apt-get install -qq build-essential cmake wget
-  - apt-get install -qq libsdl2-dev libpng-dev libtiff-dev libjpeg-dev
-  - apt-get remove -qq libsdl2-dev  # remove it but keep the dependencies
-  - wget https://www.libsdl.org/release/SDL2-2.0.12.tar.gz
-  - tar xvf SDL2-*.tar.gz
-  - cd SDL2-*/
-  - ./configure
-  - make
-  - make install
-  - cd ..
+  - apt-get install -qq libsdl2-dev libpng-dev libtiff-dev libjpeg-dev libgdal-dev
+  #- apt-get remove -qq libsdl2-dev  # remove it but keep the dependencies
+  #- wget https://www.libsdl.org/release/SDL2-2.0.12.tar.gz
+  #- tar xvf SDL2-*.tar.gz
+  #- cd SDL2-*/
+  #- ./configure
+  #- make -j6
+  #- make install
+  #- cd ..
   - mkdir build
   - cd build
-  - cmake .. -DCMAKE_INSTALL_PREFIX=/usr
-  - make
+  - cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DUSE_GDAL=ON
+  - make -j6
   - make install DESTDIR=AppDir
   - wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
   - chmod +x linuxdeploy-x86_64.AppImage
   - ./linuxdeploy-x86_64.AppImage --appimage-extract-and-run --appdir AppDir/ --executable AppDir/usr/bin/vpv --icon-file=../misc/icon.svg --output appimage
-  - # upload if branch==dev
+- name: publish
+  image: plugins/github-release
+  settings:
+    api_key:
+      from_secret: github_token
+    draft: true
+    files: build/vpv-*.AppImage
+  when:
+    event: tag
 
diff --git a/external/iio/iio.c b/external/iio/iio.c
index 7d083652..9d0ce87d 100644
--- a/external/iio/iio.c
+++ b/external/iio/iio.c
@@ -1673,10 +1673,10 @@ static int read_whole_tiff(struct iio_image *x, const char *filename)
 		return 0;
 	}
 go_on:
-	if (!broken)
-		assert((int)scanline_size == sls);
-	else
-		assert((int)scanline_size == spp*sls);
+	/*if (!broken)*/
+		/*assert((int)scanline_size == sls);*/
+	/*else*/
+		/*assert((int)scanline_size == spp*sls);*/
 	assert((int)scanline_size >= sls);
 	uint8_t *data = xmalloc(w * h * spp * rbps * (complicated?2:1));
 	uint8_t *buf = xmalloc(scanline_size);
diff --git a/external/iio/npy.c b/external/iio/npy.c
index a277b0d4..5c160afa 100644
--- a/external/iio/npy.c
+++ b/external/iio/npy.c
@@ -153,7 +153,7 @@ int npy_read_header(FILE *fin, struct npy_info* ni)
 	else if (0 == strcmp(desc, "c16")) type = IIO_TYPE_DOUBLE;
 	else return fprintf(stderr,
 			"IIO ERROR: unrecognized npy type \"%s\"\n", desc), 0;
-	if (*desc == 'c') ni->dims[ni->ndims-1] *= 2; // 1 complex = 2 reals
+	if (*desc == 'c') ni->dims[ni->ndims++] = 2; // 1 complex = 2 reals
 
 	strncpy(ni->desc, descr, 10);
 	ni->type = type;
diff --git a/external/imscript/plambda.c b/external/imscript/plambda.c
index 4fbb91a9..f833120f 100644
--- a/external/imscript/plambda.c
+++ b/external/imscript/plambda.c
@@ -259,9 +259,9 @@
 
 // #defines {{{1
 
-#define PLAMBDA_MAX_TOKENS 513
+#define PLAMBDA_MAX_TOKENS 213
 #define PLAMBDA_MAX_VARLEN 0x100
-#define PLAMBDA_MAX_PIXELDIM 600
+#define PLAMBDA_MAX_PIXELDIM 108
 #define PLAMBDA_MAX_MAGIC 42
 
 
diff --git a/src/ImageCollection.cpp b/src/ImageCollection.cpp
index 7d7c8dcc..bd0455d4 100644
--- a/src/ImageCollection.cpp
+++ b/src/ImageCollection.cpp
@@ -201,11 +201,13 @@ class NumpyVideoImageProvider : public VideoImageProvider {
         void* data = malloc(framesize);
         if (fread(data, 1, framesize, file) != framesize) {
             onFinish(makeError("npy: couldn't read frame"));
+        } else {
+            // convert to float
+            float* pixels = npy_convert_to_float(data, w * h * d, ni.type);
+            auto image = std::make_shared<Image>(pixels, w, h, d);
+            onFinish(image);
         }
-        // convert to float
-        float* pixels = npy_convert_to_float(data, w * h * d, ni.type);
-        auto image = std::make_shared<Image>(pixels, w, h, d);
-        onFinish(image);
+        fclose(file);
     }
 };
 
@@ -218,7 +220,7 @@ class NumpyVideoImageCollection : public VideoImageCollection {
         FILE* file = fopen(filename.c_str(), "r");
         if (!npy_read_header(file, &ni)) {
             fprintf(stderr, "[npy] error while loading header\n");
-            exit(1);
+            //exit(1);
         }
         fclose(file);
 
diff --git a/src/ImageProvider.cpp b/src/ImageProvider.cpp
index ab978836..1457f059 100644
--- a/src/ImageProvider.cpp
+++ b/src/ImageProvider.cpp
@@ -42,7 +42,17 @@ void GDALFileImageProvider::progress()
     int w = g->GetRasterXSize();
     int h = g->GetRasterYSize();
     int d = g->GetRasterCount();
-    float* pixels = (float*) malloc(sizeof(float) * w * h * d);
+    int tf = 1;
+    GDALDataType asktype = GDT_Float32;
+    if (d == 1) {
+        GDALRasterBand* band = g->GetRasterBand(1);
+        GDALDataType type = band->GetRasterDataType();
+        if (GDALDataTypeIsComplex(type)) {
+            asktype = GDT_CFloat32;
+            tf = 2;
+        }
+    }
+    float* pixels = (float*) malloc(sizeof(float) * w * h * d * tf);
     GDALRasterIOExtraArg args;
     INIT_RASTERIO_EXTRA_ARG(args);
     args.pfnProgress = [](double d, const char*, void* data){
@@ -50,9 +60,10 @@ void GDALFileImageProvider::progress()
         return 1;
     };
     args.pProgressData = this;
-    CPLErr err = g->RasterIO(GF_Read, 0, 0, w, h, pixels, w, h, GDT_Float32, d,
-                             NULL, sizeof(float)*d, sizeof(float)*w*d, sizeof(float),
+    CPLErr err = g->RasterIO(GF_Read, 0, 0, w, h, pixels, w, h, asktype, d,
+                             NULL, sizeof(float)*d*tf, sizeof(float)*w*d*tf, sizeof(float)*tf,
                              &args);
+    d *= tf;
     GDALClose(g);
 
     if (err != CE_None) {
diff --git a/src/Window.cpp b/src/Window.cpp
index 55894204..9e8dd771 100644
--- a/src/Window.cpp
+++ b/src/Window.cpp
@@ -374,6 +374,10 @@ void Window::display()
     }
 
     if (ImGui::IsWindowFocused()) {
+        if (isKeyDown("shift") && isKeyPressed("q")) {
+            opened = false;
+            relayout(false);
+        }
         if (isKeyPressed(" ")) {
             this->index = (this->index + 1) % sequences.size();
         }
@@ -751,7 +755,24 @@ void Window::displaySequence(Sequence& seq)
             }
         }
 
-        if (!ImGui::GetIO().WantCaptureKeyboard && (delta.x || delta.y) && isKeyDown("shift")) {
+        // keep track of the cursor when we started shifting
+        static bool isShifting = false;
+        static ImVec2 shiftPos;
+        static bool isFar;
+        if (isKeyDown("shift")) {
+            if (!isShifting) {
+                shiftPos = ImGui::GetMousePos();
+                isShifting = true;
+                isFar = false;
+            }
+        } else {
+            isShifting = false;
+        }
+        if (!isFar) {
+            ImVec2 disp(shiftPos - ImGui::GetMousePos());
+            isFar = std::hypot(disp.x, disp.y) > 100;
+        }
+        if (!ImGui::GetIO().WantCaptureKeyboard && (delta.x || delta.y) && isKeyDown("shift") && isFar) {
             ImRect clip = getClipRect();
             ImVec2 cursor = ImGui::GetMousePos() - clip.Min;
             ImVec2 pos = view->window2image(cursor, displayarea.getCurrentSize(), winSize, factor);
diff --git a/src/main.cpp b/src/main.cpp
index 0e5b1f14..3718673e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -542,7 +542,7 @@ int main(int argc, char* argv[])
             }
         }
 
-        if (isKeyPressed("q")) {
+        if (!isKeyDown("shift") && !isKeyDown("alt") && !isKeyDown("control") && isKeyPressed("q")) {
             done = true;
         }
 
@@ -808,6 +808,7 @@ void help()
         ImGui::Spacing();
         T("Shortcuts");
         B(); T("num: show the nth window (useful with fullscreen layout)");
+        B(); T("shift+q: close the current window");
         B(); T("tab/shift+tab: cycle through windows");
         B(); T("space/backspace: display the next/previous image attached to the window");
         B(); T("ctrl+l/shift+ctrl+l: cycle through layouts");