Dear ESRI, please take care of this problem or tell me where the mistake on my side is. This is forcing me to use GIS solutions in Matlab, which means I might discontinue my usage of your product. Merging tables to one another is a fundamental feature of any data management software, so there is no way ArcGIS can be used without. Best, David I am interested in an answer as well. I teach an Intro to GIS course where we are unable to complete a spatial join and save to a new *.mdg (using the Join GUI). JJM
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