I looked for the message in my PM box, it may have cycled out, sorry for not replying - it surely is not my policy.
I have too had this problem with Explorer - and I use a Netscape 7.0 Gold version I refuse to upgrade for the reason that it is package with Composer, a html editor I like. Netscape (as in firefox) seem to be less buggy with the Phpbb.
This is surely something I can't fix, I'll look for upgrades, but I got us in a bit of a problem LAST TIME I upgraded the software (the spam-bot members we see come up from time to time ) were allowed to auto-register cause the member varification software disappeared, so EVENTHOUGH updates USUALLY address such obvious issues as UNREAD POSTS, the surely is no guarentee it will be in the next update.
NOTE: I do note that, it is only when I do something in the forum OTHER THAN READ POSTS that the unread ones get unmarked: for example, go into the PMs, Check the membership list, look at any of the screens besides going back and forth to new posts.
BY THE WAY - If you click on the link in the upper right area above the main page saying POST SINCE LAST VISITED, you can get a complete list of new posts and just BACK to that page after reading posts - I think that should always work???