ITMS 7.6 HF2: Session Timeout Errors

We upgraded to ITMS 7.6 HF3 over the weekend and now we're getting some very strange behaviors. We're getting a lot of session timeout errors on different pages and subpages throughout the console. The biggest culprit is if we go into a job and then drill down on the details of the job, we get the message "The Session has timed out or the server has been reset. Please reload the page" It happens all over the place and is really getting in the way of doing work.

Any help or ideas would be appreciated. I will open a support case if no one has any good ideas.

Server 2012 R2, ITMS 7.6 HF2, SQL 2012 running on Server 2008 R2