I've installed the .536 update. Not getting the millions of timeouts any more, but still not able to connect with the email provider active. Eudora 6.1 is giving me a message "POP server [my pop server name] command error: ERR: concurrent connections limit in avast exceeded (process:NAVAPW32.exe, NAVAPW32.exe, NAVAPW32.exe, NAVAPW32.exe, NAVAPW32.exe, NAVAPW32.exe, NAVAPW32.exe,..." and it scrolls off hte limit of the message window.
Suspecting that NAVAPW32.exe is a Norton antivirus program, and that avast and NAV weren't playing well together, I disabled Norton's email protection nad tried downloading. This time, I was simply unable to connect, and I cancelled the process before getting the expected millions of timeouts and having to reboot again. Terminating avast email provider and leaving NAV running returned things to normal - I was able to download without problem.