Updated to v5.0.507 and the issue is not resolved.
Even though avast! updates with each new date, it will not manually update after that when a new definition version is available during the day.
As of right now, current version is 100415-1.
That version has already automatically installed on one of my computers,
but the other one still has 100415-0.
When I attempt to manually update, all I get is:
"Already up to date (current version 100415-0)".
I have tried a repair, and rebooted, to no avail. Sometimes the reboot triggers a new update, but not this time.
What's left? Uninstall and reinstall, I suppose.
(This issue did not exist when I first updated from v4.8 to one of the earlier v5.0 builds.)
WinXP, SP3