Access Denied message

["Gurr8" <webforumsuser@xxxxxxxxxxxxxx>]

I'm suddenly having a problem editing any page through Contribute.  I can get 
to the website when I start the program, but if I try to edit any page, I get 
this message:

 Access denied:
 The file may not exist or there could be a permission problem

 I've had no problem editing until tonight (of course when I have a deadline to 
reach!).  Can anyone please tell me how to fix this problem so I can edit my 
pages?

 Thanks,

 Jill Gurr