Same problem with me, and when i tried to login to cpanel, it stuck at connecting.... Btw, I also notice, that when one script (or more) executed at the "exactly" same time, it will cause 500 Internal server error, even with empty script. For example, I have a one.php which contain only "<?php ?>" if one.php is executed two or more times at the same time, it wlll get the error. but if, for example, two.php taking 10 secs to complete, and while two.php is executing, another session of two.php is called, there is no problem, both session will run well. So the problem is not unable to run more than one entry process, but the problem is when two or more session are initiated at the same time. Anyone notice this ? Regards