Portal problems

[NecroWolf]

Your Portal Version: 2.0.1
Your phpBB Type: Standard phpBB3
MODs installed: Yes
Your knowledge: Basic Knowledge
Boardlink: http://necrowolf.usa.cc/forum

MySQL Version: 5.1

What have you done before the problem was there?
nothing, it just started out of nowhere

What have you already tryed to solve the problem?
purged cache, reuploaded files

Description and Message
Portal works great, never had a problem until now. After you log in the portal won't load at all, gives a blank white page, or shows this error message:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 491520 bytes) in /home/a6774168/public_html/forum/cache/tpl_X-Treme_overall_header.html.php on line 281

It's not the style as it does it on all styles. All other pages work fine, just not the portal, and if you are not logged in the portal works fine. Strangest thing I ever seen, I can't figure this one out.

[archivar]

....this error message:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 491520 bytes).....

The error means you have exceeded the amount of memory on the server! Contact the owner of that server.

[NecroWolf]

Yeah I tried that, and they wanted to sell me a bigger package. I don't see why a phpBB forum would use that much RAM anyways. Funny though the errors fixed themselves and I never figured out why.