Orion,
Interesting scenario. I actually didn't know you could hold done the control key to get the same item multiple times, so I'll need to look at the scenario.
This has absolutely nothing to do with the number of FactTypes. The (benign) assert is just saying that an active toolbox item is not expected at this point. To reproduce the assert:
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Hold the control key down
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(Click method)
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Click a FactType in the toolbox
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Click on the diagram
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Start to drag a role
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(Drag method)
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Drag a FactType off the toolbox onto the diagram
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Drag a role, drop on the diagram somewhere
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Drag the role again
Thanks for the heads up,
-Matt
PS As mentioned in the readme, when you see an assert dialog, you can simply press 'Ctrl-C' to get the text content of the dialog. You don't need to go to the trouble of attaching a bitmap. The text is a lot easier to search as well.