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I would to integrate interesting points from http://www.opensourcestrategies.com/ofbiz/tutorials.php (OFBiz Cookbooks part) but I don't know the licence status.

Tables of content  

Ajax - Javascript - Json

• Disable Browser Cache for Module
• Integrate OFBiz with Yui-Ext
• An easy way to get a data structure from server to Javascript in client browser

Birt

• How to integrate in OFBiz

DataBase

        Derby

• Change a field type in Derby
• Working with multiple Derby databases
• Browse a Derby database and more using SQuirrel

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The code above is getting a "Permission Denied" message. I already check the URLs and I'm not launching a different domain (before I click I have http://domain/Login/ and after the submission I have http://domain/App/).
I think the right solution is to use clickAndWait command instead of click+pause because it always success contrary to click+pause (we dont known the page response time). I see no reason why you don't observe the same behavior with clickAndWait. Maybe it's because your are testing the login page that can be a little tricky to test due to the session handling.
To be sure to always start a test in a clean session, my tests always do the same actions :
1. logoff
2. login
3. check error

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