Users cannot publish and get error message

["wmont85" <webforumsuser@xxxxxxxxxxxxxx>]

Hey everyone.  This one is stumping us here at the office.  Some clients have 
been having a problem publishing things they have worked on from both their 
home AND their office.  The error message they have been getting is 
 [Q]Contribute encountered a network or file system error. Please try the 
operation again, and contact the administrator if the problem continues to 
occur.[/Q]
 I have done a number of google searches for this error and came up with next 
to nothing.  The users are both connecting from XP machines using contribute 3, 
which is the same set up we have here at the office.  They have been able to 
connect in the past and publish things, this started maybe a week ago.

 Any one have any suggestions?