Running WordPress MU 1.2.3-2.2.1 on a Windows box using PHP 5.2.3.3 and Apache 2.2. I'm experiencing frequent PHP memory errors (and thus, Apache crashes) that look like this:
PHP Fatal error: Out of memory (allocated 2359296) (tried to allocate 393216 bytes) in \\wp-includes\\query.php on line 935.
The common thread seems to be that with every error, a file in the wp-includes directory gets referenced. Most often, however, it's the cache.php file. Referring URLs in the error log indicate Apache craps out as someone is doing something in the dashboard (as I assume the admin UI is where most of the include files get called from).
Lastly, we've tried deactivating some plugins we suspected as the culprits and even adjusting PHP's memory. No dice. Read many, many threads on the web about similar errors--again, most reference files in the wp-includes directory--but no solutions.
Any help is appreciated.