Perpetual crashes after changing key signature

[karl-died]

Description
After changing the key signature of one file, I switched to a file in another tab and clicked on "Edit Key Signature...".
Usually the "Edit Key Signature..." menu item is greyed out, unless you click somewhere on the tab lines.
In this case the menu item was not greyed out, even though i hadn't selected anything, so when I clicked on "Edit Key Signature..." the program crashed. Now every time I try to open Power Tab Editor, it immediately crashes and throws the following error message:

Unhandled exception: Unknown object type. 0# main in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor
 1# main in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor
 2# std::__terminate(void (*)()) in /usr/lib/libc++abi.dylib
 3# __cxa_get_exception_ptr in /usr/lib/libc++abi.dylib
 4# __cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*) in /usr/lib/libc++abi.dylib
 5# SettingsTree::loadFromPlist() in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor
 6# SettingsTree::loadFromPlist() in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor
 7# SettingsManager::load(std::__1::__fs::filesystem::path const&) in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor
 8# main in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor
 9# start in /usr/lib/dyld

I even tried deleting and reinstalling the app, as well as deleting the "powertab" directory in "Application Support", but the programm still crashes and throws the same error.

To Reproduce

• Have 2 files open
• Edit the key signatue in one file
• Switch to the other file, that is in a state that usually would not allow you to edit the key signature
• Try to edit it anyway because the menu item isn't greyed out

Version
MacOS 15.0, Power Tab Editor Alpha 19

[karl-died]

I was able to reopen Power Tab Editor after deleting the /Library/Preferences/org.powertab.powertabeditor.plist file.

When replicating the bug, I got the following error message:
Segmentation fault 0# main in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor 1# main in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor 2# _sigtramp in /usr/lib/system/libsystem_platform.dylib 3# KeySignatureDialog::KeySignatureDialog(QWidget*, KeySignature const&) in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor 4# PowerTabEditor::editKeySignature() in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor 5# QMetaObject::activate(QObject*, QMetaObject const*, int, void**) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtCore.framework/Versions/5/QtCore 6# QAction::activate(QAction::ActionEvent) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtWidgets.framework/Versions/5/QtWidgets 7# QObject::event(QEvent*) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtCore.framework/Versions/5/QtCore 8# QApplicationPrivate::notify_helper(QObject*, QEvent*) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtWidgets.framework/Versions/5/QtWidgets 9# QApplication::notify(QObject*, QEvent*) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtWidgets.framework/Versions/5/QtWidgets 10# QCoreApplication::notifyInternal2(QObject*, QEvent*) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtCore.framework/Versions/5/QtCore 11# QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtCore.framework/Versions/5/QtCore 12# qt_plugin_instance in /Applications/Power Tab Editor.app/Contents/PlugIns/platforms/libqcocoa.dylib 13# qt_plugin_instance in /Applications/Power Tab Editor.app/Contents/PlugIns/platforms/libqcocoa.dylib 14# __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 15# __CFRunLoopDoSource0 in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 16# __CFRunLoopDoSources0 in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 17# __CFRunLoopRun in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 18# CFRunLoopRunSpecific in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 19# RunCurrentEventLoopInMode in /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox 20# ReceiveNextEventCommon in /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox 21# _BlockUntilNextEventMatchingListInModeWithFilter in /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox 22# _DPSNextEvent in /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit 23# -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] in /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit 24# -[NSApplication run] in /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit 25# qt_plugin_instance in /Applications/Power Tab Editor.app/Contents/PlugIns/platforms/libqcocoa.dylib 26# QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) in /Applications/Power Tab Editor.app/Contents/Frameworks/QtCore.framework/Versions/5/QtCore 27# QCoreApplication::exec() in /Applications/Power Tab Editor.app/Contents/Frameworks/QtCore.framework/Versions/5/QtCore 28# main in /Applications/Power Tab Editor.app/Contents/MacOS/Power Tab Editor 29# start in /usr/lib/dyld

[cameronwhite]

Confirmed, thanks for reporting!