I've learned not to assume anything when replying in forums, so I have to ask. Have you tried restarting your system?
 

telecharge
I've learned not to assume anything when replying in forums...

 
Which is a very good strategy!
 
 
 
 

A good strategy it is ... as is checking power first.
 
Unfortunately, the restart didn't change anything, the graphic thumbnail still does not display for the template in the Start Screen.
 

TranceCanada
Maybe you have a minor problem with your install

How would one go about determining that?  Personally, I would think that an issue with the install would have manifested itself in other more complex ways as well ... and everything other than this is working fine for me.  But of course, any suggestions are most welcome.

OK, I've finally got it.  Changing the graphic to 96x96 pixels and trying the same thing again worked.  If you look at the thread I linked in the first post, there was talk about the graphic actually being 172x172.  I checked this myself, and it was indeed displayed at that size, so I used that size for my custom graphic.
 
But NO!    Apparently that's not the way it works.  Once I changed the graphic to 96x96, it shows up in the Start Screen fine.  I don't know if it can handle anything larger than that, as I haven't tried it, but I may.
 
Thanks to everyone who thought about this and offered suggestions!  I appreciate it!
 
Pete

Total shot in the dark here as it could be completely unrelated, but you could try clearing your thumbnail cache with
Windows Disk Cleanup Utility.
 

 
You could also try searching your computer for the file(s) in question to where there are copies.

Here's the answer about maximum size of the Start Screen thumbnail - 131x131.  As soon as you hit 132x132 it stops displaying in the Start Screen and reverts to a "default" graphic.  Hopefully this has saved some headaches for other people!

Man, is NOTHING simple and straightforward???
 
So I thought I had it all figured out in the above post.  But ... when I just tried a 131x131 graphic on a different template ... it did not work!  Turns out that this time the maximum was 106x106.
 
It seems pretty clear to me it depends on something more than just dimensions.  It may be file size.  In both cases (the template discussed in the above thread, and the different template I was working on now) what worked was either well under to just under 48K file size, and the sizes when both graphic files were no longer seen in the Smart Screen was just over 48K (e.g. 48.3K).  Coincidence?  Maybe, maybe not.
 
I think I've had enough for today.  If anyone concludes anything more conclusive, please to post here!
 
Have a great evening!