Members will occasionally complain that smilies stop working every so often, and sure enough when I click on the editor button, I get an error message popup instead of the smilies appearing: "The requested page could not be found".
At first, I re-uploaded the XF files (as it looked like something was missing because of the error message). But, it keeps on happening.
As a test, I just restarted IIS... which fixes the problem again for a short file.
What on earth could this problem be as it is driving me crazy! It's happening on multiple sites/servers, so it's not peculiar to that one install - but the server setup is identical.
Win 2k8 R2 server, latest PHP 5.4, IIS, Zend Optimizer+ opcode cache