Using both Mac and PC

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New here and trying out different maps on both Mac and PC to see which I prefer.  Downloaded Mac versions from this site and loaded on my Rino 530 HCx.  Worked just fine.  Then I went to the PC and tried to install maps from Garmin Topo USA 2008.  Tried to connect the rino direct but the memory card could not be found.  Then took the card out and installed map via card reader.  Now the Rino doesn't find the memory card.
Do you have to use only one platform or can you go back and forth.  How do I get the Rino to find the card again.  Do I have to reset the unit and format the card?
Thanks

[Indrid Cold]

I go back and forth between Mac & Windows without any issues. You may have to reformate the card, does you gps have the current sw?

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Thanks for the reply.  Just restarted the gps and it loaded the maps.  All working great now.