Card Images displaying incorrectly

[Retsam]

I've been having trouble with LackeyCCG on my older computer.  When I first install it, it runs fine.  But, after awhile (I can't pin down how long it takes), the images all fail.  I can't see most cards, and spawn cards generate a black bar through the screen, the height of the card.  Then, it seems that the only thing that I can do to fix the problem is to reinstall LackeyCCG and redownload the plugin.  I'm not sure why this problem keeps occurring, and I don't know how to fix it.