SeaMonkey Starts With Blank Tabs

[Big Jim]

I always have had SM set to "Restore Previous Session" at startup. A few 
times recently it completely lost the previous session information for 
some reason.  Beginning today, SM starts with the same number of tabs as 
the previous session contained, but they are all marked "Untitled". 
Reloading tabs just loads blank ones again.
It is not my antivirus or firewall (Norton) causing this. I disabled it 
with the same result. Once SM is started tabs open normally from links, 
bookmarks, etc. Also, if I click on "Home" my home group of pages as set 
under "Preferences" opens.
If I set SM to open with my chosen home group and close and reopen it, 
it starts with the chosen group, but if I click to "Save the previous 
session" when closing SM, it will again restart with blank (Untitled) tabs.
I tried restarting my computer but it made no difference. I also tried 
reinstalling SM, but it also made no difference.
Thanks for any assistance.
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