Glad to hear! This particular issue looks to be fixed in 10.2: NIM085149 -Python toolboxes crash ArcCatalog when previously run Python toolbox tool results are saved with the application. I've deleted the .dat file and changed the Geoprocessing results to Never Save. ArcCatalog still crashes when opened, but works just fine via ArcMap. Any ideas? Running 10.1 and did use a new tool from Esri before this started. Thanks, sk
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