SYMPTOM:
In Strategy Web, users are not able to search for attribute elements in a prompt. When the search button is clicked, no elements are returned and eventually the request will time out, as shown below.

CAUSE:
When using Strategy Web 10.1 through a portal server, an out of the box plugin can be used to enable portlet to portlet functionality.
When this plugin is used, the following can occur: Due to the same-origin policy applied in most browsers, the browser will block a frame from loading when the origin does not match the document.domain that was set to in the request. Chrome Developer tools will show an error similar to below:

Uncaught SecurityError: Blocked a frame with origin xxx from accessing a frame with origin yyy. The frame being accessed set "document.domain" to zzz, but the frame requesting access did not. Both must set "document.domain" to the same value to allow access.