Out of pocket for a while, but thanks for the reply. I am not running the latest beta, but the stable release 1.74.
I am running Mala at 1024x768 with a fixed size layout, since I have no need to switch resolutions. The disappearing background images only happens when I am switching emulators, and even then is random. "A" works fine, "B" has missing backgorund, "C" works fine, "D" works fine, "A" has missing background, so on and so forth.
One thing that I tried differently was to create a batch file that kills explorer.exe, then loads Mala. Of course, at Mala exit, I have it running explorer.exe. I thought that this resolved my issue temporarily, but I still randomly lose my background layout images.