New answers tagged update
Yes there is a cache on the local machine. At version 10.1 it is: C:\Users\user name\AppData\Local\ESRI\Desktop10.1\AssemblyCache In the AssemblyCache folder will be a folder for each add-in ArcMap has loaded. The folders are named with a long alpha-numeric that won't make any sense, but if you click into these folders you will see .dll, .pdb, and .xml ...
You should try deleting the Normal.mxt file on their computer. Go to: C:\Users\Name\AppData\Roaming\ESRI\Desktop10.2\ArcMap\Templates and delete the Normal.mxt file. This will remove all toolbars/customization from ArcMap. Here's a little more information from ESRI.
Not sure I am understanding the workflow correctly but like Beck said I think this is does the trick. Foo is the original shapefile you are deleting all the features from, Bar is the layer you are copying features from. import arcpy # Data foo = r'C:\Path\to\layer\that\will\be\blank.shp' bar = r'C:\Path\to\layer\that\gets\copied.shp' # Delete Features ...
when you join a table, the names of the fields to be used in ArcGIS becomes a concatenation of the name of the table and the name of the field. So you should try with fields = ["Potash_Rates.Potash","pt_tst.LB_P_SQM"] also there is a small typo in your raster name, but probably not in your original one cursor = arcpy.UpdateCursor("pt_tst_lyr") should be ...
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