MP1.2 + irblast (1 Viewer)

[tmmp]

I'm using build 4189 and the following error on WinXP (and win7)

The IR Blast log has no errors:

2011-05-08 11:42:56.796875 - Log Opened

If I use an older build (3344) IR Blast works correctly but of course this version is not compatible with MP1.2

Any ideas?