We are currently using the jQuery library as part of providing a SharePoint solution. We are using the library to provide the client with a rich interface in the browser. 

We had included the references to the jQuery library in our Master Page for the site. We had had developed several Sharepoint web parts which in some cases needed the jQuery library.

Since we started using it we have seen our SharePoint pages get 'stuck' very often - mostly we have had to kill our browser sessions. The behavior is inconsistent and there is not specific way to trigger it off - just loading a page does it. The first pointer to us that it it had to do with something related to loading the jQuery libraries was when our browser in some instances started throwing the error below - we were using Internet Explorer 7.

Error: 'jQuery' us undefined

Code:0

Current Solution: We copied all the jQuery to the local web server and everything seems to be working properly now. I will find a long term solution, but for now this will do.