UBB.threads PHP Forum Software Community Forums UBB.threads Version 7/8 Support IE7 returning Error 406

I've noticed that if I search for a users IP address and it returns no results, when it forwards to the Member Management area the browser returns an "Error 406 - Not acceptable". Once this error has occured I can't even access the forum list. I have to close the browser and start again. Can I stop this from happening?

This only seems to happen with IE7 and not Firefox.

There's more info about this here: http://www.checkupdown.com/status/E406.html

Error 406 is generally triggered by a Mod_Security issue; so it's odd that it'd show with one and not the other... (search the forums for mod_security, we've had numerous issues with this anal retentive 3rd party security module on some webhosts)