ServiceDesk

I am hoping someone has see this error before or knows what might be causing it.  Allot of our workers are getting this "Process Manager Error.  Failed to Load Viewstate" message (see attached screenshot).  This seems to be happening after a user has reassigned the ticket to themselves, let's the ticket autorefreshes and then tries to "Post Time" on the incident.  Any thoughts or ideas on this issue would be a big help.  Thanks!

This error means the view state that IIS currently has for the user session has been modified during an operation that doesn't allow the modification. 

This can happen when postback events haven't finished completely processing before the user continues modifying the page.

So is the solution to have the user wait a longer period of time after assigning the ticket to themselves and posting time?