Clues on Browser Message Read issue

[XFFA.IR Bot]

We've had some instances where user's browsers fail to mark a thread as read. It gets stuck in the browser's cache (I think) and refuses to let go, even with edits and further replies. I would have written this off except it's now happened to me a couple of times on two different browsers. I found that by clearing cache, the problem goes away.

Can anyone point me to somewhere that I can start researching this. I don't even know what table may be involved, but I'm presuming there is server...

لطفا گزینه ورود یا ثبت‌نام را انتخاب کنید تا پیوندها برای شما قابل نمایش شوند