@Sommerregen, @rhukster and @flaviocopes, Thanks for the pointers...
@Sommerregen, adding those lines (55-60) of login.php after L41 didn't seem to change anything.
I'm sorry, I think I goofed up in the first test of deleting vendor and doing the composer install... wound up doing the composer update and so far, it seems to have fixed it.
This was the output of what a composer update performed, if that tells anybody anything:
Updating dependencies
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Removing erusev/parsedown-extra (0.7.0)
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Installing erusev/parsedown-extra (0.7.1)
Loading from cache
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Removing symfony/yaml (v2.7.6)
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Installing symfony/yaml (v2.7.7)
Loading from cache
-
Removing symfony/console (v2.7.6)
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Installing symfony/console (v2.7.7)
Loading from cache
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Removing symfony/event-dispatcher (v2.7.6)
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Installing symfony/event-dispatcher (v2.7.7)
Loading from cache
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Removing symfony/var-dumper (v2.7.6)
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Installing symfony/var-dumper (v2.7.7)
Loading from cache
So, is it a good idea to do a composer update regularly? Sorry, not quite sure what that one is doing.
Happy Thanksgiving to anybody that happens to have that holiday where you are :-)