StrokeIt exits when starting Firefox

I just installed the new Firefox (v 1.0.7) and when I use any mouse gesture to start it, StrokeIt just exits. Other gestures work. For example, when I use the gesture W to start Web Browser StrokeIt crashes. When I change the action to start something else (any other program), it works normally. I even tried to set the W gesture to start firefox manually (with Run Application...) and to change the Firefox start gesture and it didn't work.
This worked normally with FFox version 1.0.6...
If anyone knows the solution to this problem, please share it with me!