Stabilization with "FX Vegas Stabilization" on a clip is too complicated.
1) First right klik on the Clip and choose FX, than choose "FX Vegas Video Stabilization" The stabilizator is locked.
2) Then right klik the Clip again and choose Media FX, Than choose "FX Vegas Video Stabilization" Now the stabilizator is open.
The 2) session is yoo much klikking to use the stabilizator. The 1) session schould be enough.