This problem stumped me for a while too, but I figured out a solution: From the GIS Servers service list, right click your service --> Manage Cache --> Manage Tiles. Next in the Manage Map Server Cache Tiles dialog, make sure Recreate All Tiles is specified in the Update Mode variable, the click OK to create the tiles. This solution seemed to work great for me, and my tiles were created successfully after this tool was finished running. I don't however claim to be an expert in creating map service caches. Brad Findlay GIS Analyst City of Rancho Cordova
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