Hello there, using MT 3.1 and have been able to post just fine for a while, but now I am getting this error message:

Out of memory during "large" request for 528384 bytes, total sbrk() is 11068720 bytes at lib/MT.pm line 638

Now when I try to post it does save the entry it doesn't actually end up on the blog. Rebuilding the site returns the same error. Any pointers on what I could do to fix the problem? Thank you...