Solved. Reformatted card using sd formatter, reloaded all maps and they all work. Very odd. Card was new and was preformatted fat32, but there was some issue, since the maps were removed and reloaded after the attemps described above....
The card performance is flaky. Subsequently trying to add maps they are not recognized. Could be this card or a problem with Patriot CL10 16GB sdhc cards. There are a lot of feedback comments on newegg regarding issues with this high speed card. It may be that garmin likes the slower CL4 or maybe CL6 cards. I have several CL4 cards that have no problems.
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