Unable to Star Ticket List Views

Unable to Star Ticket List Views

I currently have 9 ticket list views "starred." I had 12 starred a few days ago, but while trying to troubleshoot this issue, I removed some lists I felt I could do without. Whenever I click on the star from a ticket list view to add the view to my starred list, I get the error message "unable to process the request" in a little red box at the top of the screen and the star does not turn yellow or appear in my starred view. 

Initially I thought this may be because the number of views I was allowed had been surpassed, which is why I "unstarred" a few more; however, I am still unable to add any new starred views. I start with a new browsing session with a cleared cache, cookies, and history every morning. This has been ongoing for days.