HTTP Post Body dropped using PHP

Uploaded HTTP POST body appears to be missing or blank. Can cause strange application errors as a result. 

When uploading ForceField orders, error message that manifests complains about a blank function that cannot be executed. 

TLD:

From what I found, it may be related to the value (whether set or defaulted) of the "upload_tmp_dir" param in php.ini and/or the permissions on that folder.
Also might be due to an override in virtual hosts config (vhosts.conf ?), see this post: https://bugs.php.net/bug.php?id=74189

That makes sense, if it gets to apache but then apache fat-fingers it and drops it before handing it off to the php runtime to execute the sync script.