Solved
In windchill 12.1 workflow editor is not showing any robots
Windchill 12.1 workflow editor does not show any robots:

Windchill 12.1 workflow editor does not show any robots:

I encountered this error as well. It was client based as I was able to use the workflow editor from another PC and it worked fine. I would recommend trying another browser, or try clearing the cache of the browser.
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