I have no idea if this is a flirc or xbmc bug (flirc is suspect because I haven't seen the problem using keyboard or mouse).
I have a key mapped to Favorites. This pops up and I can select and play a favorite.
If I put the PC into sleep when it wakes up everything works as expected BUT then (randomly) selecting a favorite stream causes a complete lock-up of the PC. Only a hard reboot can recover.
Win 7 32 and pre-Eden xbmc.