White Fullscreen crash when running network version

[Dbuckland]

When we run a script using viz.go(viz.FULLSCREEN) the monitor goes all white and the code doesn't run. This is only occuring on Network versions of Vizard. When we run the same code on Development versions the fullscreen works fine, and when we run the code using viz.go() on the network versions it works as well. Have you seen this before?
All computers are using 2.53g and the liscence server is the latest one.

Thanks