Is there any way to fix the user forms?
I have already removed all the references to the slickboard application form my template files.
You should also in future use the jquery bundled with SilverStripe in sapphire/thirdparty/jquery/jquery.js since alot of modules (forum, userforms at least) will include jquery on the front end (the one from sapphire) if your code uses the one in sapphire like below it will prevent loading 2 jquerys to the same page (which is bad for performance)
Use this line in your Page.ss to include the jquery from sapphire and prevent duplication. (Uses jquery 1.4.2)