http://www.icyphoenix.com/viewtopic.php?f=4&t=1520&p=11368#p11368
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Zuker
Thu 05 Apr, 2007 15:59

DEBUG - How To Deal With Blank Pages Or Only Header Shown
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If you can see only the header of your forum or just a blank page, take a look if you can change the memory limit  value and solve the problem.

add at the top of [b]common.php[/b]

[code linenumbers=false]ini_set("memory_limit","12M");[/code]

Some times, a [b]Fatal error: Allowed memory size[/b] appears also. The fix for that problem it's the same written here