Emulator

This is probably like the most minor, annoying, oldest, and dumbest of all problems, but you wouldn't believe the number of times this has come up on the forums. From 3.0-539 (rd15740daf124) on, when selecting a device in the GCpad and Emulated Wiimote windows (at least on Windows), clicking on a device makes the device display blank. Cue newbies freaking out and trying all kinds of things to make it work, and then whining on the forums.

Selecting Device - http://img266.imageshack.us/img266/5528/selectingdevice.png
Oh no! - http://img267.imageshack.us/img267/9707/ohnom.png

Hitting Refresh will display it, and hitting OK and then coming back will also display it, and it works even with the display blank. So the Device Dropdown is working properly, it just isn't displaying properly. But it's very disconcerting seeing it for the first time. This may only be a windows issue, cause well, I don't have Linux or OSX.

3.0-135 Win64 - fine
3.0-235 Win64 - fine
3.0-409 Win64 - fine
3.0-509 Win64 - fine
3.0-539 Win64 - broken
3.0-555 Win64 - broken
3.0-600 Win64 - broken
3.5 Win64 - broken
3.5-1180 Win64 - broken

Tested on:
Core i5 3570K @ 4.7ghz
nVidia GTX275
Windows 7 x64