From issue 53 I assume this is all slick. Please verify that you are
running r619 or later, by checking slick.bat and look for the -j
option, which is now default and makes the game use JInput instead of
the LWJGL input handler.
So this might be newly introduced problems with JInput.
Also see issue 39:
http://code.google.com/p/nullpomino/issues/detail?id=39