Hey there Dr. Geep,
Thanks for the input - but that doesn't seem to be the case either, by which I mean watching YouTube while Poser is running, something I seldom (if ever) have done before today. 

Rebooting does seem to work - sometimes - not all and this is a really capricious little happening, not much rhyme or reason apparent to me yet.  I would say, though, that once it stops happening it seems to be gone - as long as Poser isn't closed.  Once it goes away it seems to stay away - until the program is closed and reopened.

Doesn't seem to affect Poser in any other way, and really is more annoying than anything else.  Thanks again.

Larry F