TabControl redraws through windows on top

I have a .NET c# form with a tabcontrol on the base form. This tabcontrol is absolutely loaded with sub controls and tabs. If I launch my application and immediately open another window (in my app), I can wait about 3-5 seconds and the tabcontrol in the back of the newly opened window will redraw itself and the areas that get refreshed are actually painted through the above window. Almost as if the tab control is redrawing itself through the window above it.

I've looked into every event on the tabcontrol I can find, and nothing is getting called when it is refreshing. So there's nothing simple to unhook to prevent this.

Any ideas how I might solve this on开发者_Go百科e?

Turns out, my computer is the only one that does it. I've tried this application on a couple other computers, and they all run it just fine. Very strange indeed.