I had the same problem on my page (Pakistaniat.com). In my case it turned out that it was because I have moved up to PHP5 and that needs a small change in cache.
see here
http://www.bloggingblog.net/wp-cache-and-the-blank-page-problem/
I am having teh same problem. The XML file from WP.com is 2.9M and changing the php.ini numbers has not helped.
table4five, do you know WHY it chnaged in your case.,.. was it the htaccess file?
Or was it becasue bluehost might have geneally reset the apache over nnight….
I guess I was wondering WHAT you did that made this happen… I am really feeling very frustrated right now and BlueHost is not being very helpful either…
anyone, please help!