>>Hi Michel,
>>
>>When I tried to Search and got some results, I went to the first thread, checked it, then tried to use Browser Back button to get to the list and select another thread, but got "Page is expired" error message. I tried few times with the same problem. I didn't have this problem before.
>>
>>What could it be?
>
>Can you give me the exact simulation path (click by click + search criterias)?

Search by DATE() TRANSFORM(), found couple of items, go to the "Converting to date" thread, then go BACK (BACK button on Browser), select another thread, read first message, then expand the whole thread, BACK, BACK and got this message.

I think, the second BACK is not needed...