Although I don't usually mess around with beta programs I did try out the 4.5.494 build. I like it so far!
I did make a mistake the other day. I have automated update for new versions set to notify me. I got a message that there was a new update and I clicked to install it. After it installed I found that I could no longer get my mail, and Avast would hang. There is an icon in the tray that shows when avast is checking mail and even after closing out of OE the icon stayed in the tray, only restarting the PC removed it. Then I turned avast off and still couldn't get mail.
The only way I could get mail was to restore my PC with a image I made the other day.
So now I have a questions about updating from the beta version when it's no longer beta. I assumed that the update yesterday was the new 4.5 but I guess it wasn't. I don't know what was in the last program update, but it sure did mess up the beta version.
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