Problem with deck

Hi! :) I'm creating a "Monopoly-game"  for my friends and me. It's super cool, but i have a problem with cards.  I've created specifics cards for the game and also a deck.  The problem is that when i click on "Show" , the deck doen't appear, but there is a littlte white square at the place it should be.  I thought i was beacause of my "home-made" deck. I tried with the "default-deck".  Same probelm... :/  In other games , all is working correctly .  So please, can you help me? ^^  Thank you! (Excuse my English, i'm a 16 french tennager ^^) PS: I've searched an answer in the forum or in the tutorial, nothing helped me... 

Did you upload a card back image on the deck?

Yes, and there is also a card back image on the "default-deck" :/

Is there a recomanded size and extension for a cad back image?

Probably .jpg or .png. The size is not so important. Maybe 140x210 ? 

Mandrhis , could the issue you're experiencing be the same as the one reported here?

The Aaron: I've tried with .jpg and .png, so there is no mistake for this fianally! ^^  I'll try it, thank you! ;)  Silvyre: Oh! :0  Sorry, I didn't see it :/   Chrome is my browser too, and hasn't any extension wich can interfere.  My front/back image of the card have the same size. I have an answer now ^^  I'll wait 1week too! ^^ Thank you! :)