I experienced this behavior due to a (custom) event skin problem in IE7. The browser would resize one cell, which would appear to cause circular and cascading resizes in other cells. Since it was a custom skin, I did not log it as an issue in Gemini. However, if you are experiencing this behavior with a provided skin, please do so at http://support.dotnetnuke.com. Since this appears to be a pretty rare issue, try and include as much detail as you can!
I can't for the life of me recall what I did to fix it, but I do remember that it required a change in the skin .css file. Sorry I can't be more specific, but hopefully this points you in the right direction!
Brandon