I tried to use the Mark Forums Read button but it wouldn't work. Then I clicked Forums on the main blue bar to get to this forum and got a Bad Gateway error. Eventually I got here but so far no luck with Mark Forums Read.
Chrome on a desktop pc. And a few minutes later it all worked fine. Maybe some of the chipmunks were on a break then and the wheel wasn't turning quite fast enough.
Everything seems to be working now. I will check the logs to confirm but my guess would be that the server was trying to handle too many processes at that time which resulted in yours timing out.
