Flash CS4

Last night, I was working at home on Flash CS3 and the tutorial was working fine, but when i got to school and got on to CS4, nothing worked

I looked at this
http://forums.adobe.com/thread/481644
and found this...
"What I discovered was CS4 does not play nice with networked drives. If your operating on a network try saving your work to the desktop

Cheers

Joe Huck"

I saved it onto the desktop and it worked fine