Parallels

Symptoms

There are directories on a domain with different versions of PHP (4 and 5) enabled. When browsing php pages one-by-one, they pages hang.

Cause

Such PHP behavior can be observed if PHP of both versions is installed in ISAPI mode on a domain. Two versions of PHP use the same Application Pool. The problem lasts for a short time after the application pool has been restarted, after that pages are refreshed normally and can be browsed as usual.

Resolution

Unfortunately such behavior cannot be avoided. You should wait until the pages are reloaded.