I can't say that I recall encountering this problem. The list should consist of all the columns of the table being used as the fact table. You can see those columns in the source pane, which you can see by clicking on the show metadata checkbox in the view menu.
You will notice that there is an error overlay icon on the measure dimension (it gets propagated up to the cube and to the model namespace as well). Click on the measure and view the issues tab. Tell us what errors say. That could help us understand what cube designer thinks is a problem.
If you click on one of the issues you will be able to move the mouse pointer to select all the text and copy it.

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IAN HENDERSON
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