That was the suggestion which came to mind when i received an email from my host about my installation of photopost causing their server (I'm on semi-dedicated) to become unstable, then asking me to move up to a more expensive hosting service.
I'm not sure if this was an attack of some kind but my host tells me of running 'parallel scripts', I'll include their email below, i don't know what to tell them as this is out of the blue, they have disabled my gallery directory as a precaution, is there anything obvious to you? see below...
Your account "site.com" hosted on the SDX server site.nocdirect.com is running various CPU intensive php scripts and mysql queries which are putting very high load on the server and due to which server is going unresponsive.
Please have a look at the follow details about your php scripts running in parallel.
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Thanks for the help.