Wda_ls_main.js - Script Error IE

Question

Hello,
i am experiencing problems with the wda_ls_main.js using Internet Explorer 7and CRM 7.0. The Internet Explorer constantly reports an Script error, while the same WDA-Application is running without problems in Firefox 3.5. I've done some research regarding the cause, the lines 356-358 seem to be the problem.
var instance = this.getComponentInstance(id);
instance.attachEvent("onactivate", this.focusForwarder);
instance.attachEvent("ondeactivate", this.blurForwarder);
instance is null so every call of a method results in an error.
I set an breakpoint in Firefox Javascript Debugger on these lines which is never hit.
Any help to get rid of this error is very appreciated.
Regards,
Arne

Answer 1

Note 1454373 worked.
However, deleting the Browser files needs to be done manually. In some cases the Delete button doesn´t work properly.
Internet options --> In section ´browsing history´ --> settings --> view files.
Then delete the files manually.
Thanks!