Just as balinor stated, any issues with PHP 5.3 were dealt with 2 years ago (July 2009) when PHP 5.3x was first released. And in actuality, the "blank page" syndrome is related to the host not properly accounting for ioncube support during/after the PHP/Apache upgrade and re-compile.
Let me take a wild guess: are you hosted with "Pair" by any chance?
@breakloose, if you're still having problems, just contact us at our web site and we'll get you sorted out.