For same reason, the white background seems to have disappeared from my posts section on this blog. I'm not sure why this has happened, as I didn't do anything that seems likely to have caused this problem.
Anyway, I've asked blogger for help, so hopefully they can figure it out. Worst case scenario, I may have to revert back to a default template and re-customize it. Bleh. One way or another, I'll get it fixed within the next few days.