@rudy_v I couldn't reproduce the error. Perhaps you could include an example workspace, data and let us know the build number of FME you're using. A short movie of the steps you use to generate the error sometimes helps. If the data is sensitive then please open a support case through https://www.safe.com/support/report-a-problem/

Hi @rudy_v - did you by any chance leave the workspace open and return the next day, continuing the next day? I have experienced similar things when the workspace is open for too long (seems to be some caching related).