Lol yeah sorry.  I tend to do that when I am doing 3 things at once!!  I did not understand what you meant by the card being fake?  So I assumed you meant it was not a 4 gig card, but something with less capacity.. 2 gig or lower.. ... Thanks for clearing that up..   Ebay are not willing to refund your money? I thought part of there blurb, was to protect the punters from such problems... Was the card you bought sold as genuine, has it got all the right labels etc? Or is it the poor performance you feel makes it not genuine?  A real card as a lifetimes warranty and any dealer will replace it if it is faulty...  

50 degrees would take the operation of the camera into question. I have used mine in hot and humid conditions of 43 degrees, Canon give 40 degrees in their stat sheets as Max ... In my view with a genuine card the camera would be the weakest link in any case.. Properly stored and with the use of plastic bags to prevent condensation forming inside the camera I doubt you will have any problems, but you may well be risking damage if you were using the gear in that sort of heat and humiditity. 

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt