As of now:
- skins on versions that support them
- crash on start with Indev and Infdev versions
- crash due to broken controllers support with c0.0.14a to 1.2.5
- gray screen on a1.1.1
- online mode support
- running Classic/Indev/Infdev versions on MacOS 10.7+
- running versions before 13w16a with no dependency on Java AWT/Swing
- flipped color channels on versions before 13w16a on Silicon Macs
- unnatural clouds on AMD graphics
- ModLoader support for Java 9 and later
- running Preclassic versions and c0.0.15a-c0.0.16a_02 on Java 5
- sound on early Indev versions
- joining servers with c0.0.15a
- unnecessary duplicates of sound files and assets
- offline saving in Classic versions