TrackSkull is fully compatible with both TrackIR 4 and TrackIR 5, but there is a small issue when using a TrackIR 5 camera.
The feedback display (green dots on black background) pictured below does not show the full area of a TrackIR 5 camera. TrackIR 4 has a resolution of 355x288 which is what is shown in TrackSkull, however TrackIR 5 has a resolution of 640x480, meaning you are only seeing the upper-left corner of the actual display.
IMPORTANT NOTE: This issue is just an inconvenience and does not affect any data being recorded or outputting to a servo controller (puppet mode).
We are working on resolving this issue. Thanks.