>>During the past several weeks I have been having problems using UT. It looks like on every second click (every other message I want to read) it takes very long to get the message. Sometimes when I post a message (and I don't post many) it takes several times until the message goes to the board. I use FireFox 3.16.13. Is this an issue with Firefox or UT?
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>>UPDATE. While posting this message, I clicked on Send. The browser says Done but the message is still in the state when it was not posted (I see command buttons Send and Preview at the bottom).
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>I'm using the same version of FireFox (I think you meant 3.6.13) with no major issues.
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>Occasional unexpected slowness viewing a message in the lower pane after clicking on its link in the treeview (sometimes up to a couple of seconds rather than nearly instantaneous).

I've had the issue Dmitry described about a week ago (in IE) but it got fixed.