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The problem was with the ability of the NUVI to see the card.
I searched the Garmin support website. If the NUVI won't see the card, you must do a MASTER RESET without the card inserted. Then insert the card and it will read the card. It worked on the 5 NUVI 255's I was loading.
 
To do a MASTER RESET on the 255:   (the 255 has no reset button)
1-remove the SD card
2-turn unit ON and allow to fully bootup
3-hold the ON/OFF slider in ON position for 8-10 seconds and then release

Some other models have a master reset button on the bottom

Hope this helps someone else.

Thanks...will try these suggestions right now

I'm loading MapSource created maps on 5 NUVI 255's. I know the SDcards are good to go. 3 of the units don't seem to see the card. The 2 units that see the cards will read all the cards. The other 3 don't.  However you can load maps to internal memory OK on the 3.
What could be the problem? I had same problem with NUVI 205W's.

The problem may lie with me. The card I flashed yesterday afternoon is working this morning.
Thank all yall who responded.  Have a good day!

I used MapSource. There is a garmin folder on the sdcard with a gmapsupp.img file within. It seems that the GPS doesn't see the card.

I can load maps to NUVI internal memory OK, but can't make NUVI see maps loaded to the sdCard. how do i get the nuvi 205 or 500, or other unit to see the maps on the sdCard?