This one is sorta strange. I built a module to track an inventory of items that we have here at my company. The module was working correctly for a while, but recently it began to misbehave.

Currently, when I press the link from the main menu to access the module, I get a white space where my module should appear. If I change to a different theme while still in that module, the screen shows up correctly. The screen goes white again if I press any of the links within the module page until I change themes again.

I have used PHP Debug mode to see if there are any fatal errors, and there are a few variable warnings, but nothing serious. Has anybody encountered this before?

Ivan