I too was having the "white out" issue with Gmail and followed the suggestion by a few of the forum members to clear the Gmail cache.. I have NOT had the problem since.
For all of those having the "white out" issue with Gmail, I highly suggest you try clearing the cache for Gmail.
Thanks to everyone that suggested this fix. It has definitely worked for me.
Please report back if the issue re-surfaces. I went as far as reloading the firmware on my phone. It worked for a while, but the problem continues. I'm hoping either a fix to Gmail or another OTA update is in the works.