I've been getting this error message alot lately when opening vegas projects that I'm working on. The message is something like this.

The audio plugins specified are not found on this system.
0000000000-000000-000000-000000-Transition
0000000000-000000-000000-000000-Transition

Anybody familiar with this? I think maybe I am loosing some transitions and they are being changed to crossfades...I'm not sure though.