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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.
Is the system OOTB installed or is it a upgraded one?
Try to use ctrl+F5 or try to use different browser, or try to delete temporary files of the browser
My system do not has problem
Wch 12.1.2.0
browser: Chrome
PetrH
I would check access rights on windchill codebase files, especially images. Its possible the apache browser is unable to serve them since they are set wrong.
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.