Look at me, double posting on my own self.  Tsk, tsk...
Sorry, Pocketbook, but I have abandoned version 15.2.  Because what I described above happened again (with FBreader, the one I was reading).
Oh, and I forgot this interesting part (which I discovered in my resetting process today):  After [in this case] FBreader froze, I downgraded to 14.2 to "make it all better."  The same thing as the other day - even after going back to 14.2, I 
still could not open FBreader (the default one, as I had already deleted FBreader180 from the device). 
So, it was off to hard reset land for me.  As I type, I am slowly putting all my fonts, logos, etc. back onto the device.  Oh, and FBreader180.  
So, I tried.  I could live with the crashes, but not when a crash removed a reader capability from my PB360.
I'll miss double clicking straight to the main menu - but I'll be 
reading while I miss it.  
 
Back to the drawing board, gang!  I'll be waiting for a "new and improved" 15.2 ... or 15.3.  
Don't get me wrong - I'm still loving my PB360!  I'm just hating 15.2!  
 
Thanks.
Marilyn