Further to my original and first post above, I tried again to install the latest version of Avast over the older version and the problem persists.
TQSI's comment shows that the most recent Avast definitely has a problem with Eudora 7.
Unfortunately,
Pondus' suggestion that "you
may need to do a clean install of latest version" & "Uninstall our software using avastclear" is sort of a gamble if special care is not taken before doing so.
A solution that "will" work instead of "may" work would have been appreciated. The suggestion means the uninstall will delete the old working version to replace it with the newer, and maybe still problematic, version. A throw of the dice......
I guess a
SYSTEM RESTORE point prior to uninstalling the old Avast is definitely in order.
Also a comment of someone who has tried the suggestion would be welcomed.
Meanwhile, I just might try it, with a restore point created beforehand, if I can summon enough courage to so.
Decisions, decisions......