SingleOutputMapAlgebra_sa "succeeds", but no output

Discussion created by ESI2010 on Jun 4, 2013
Latest reply on Jun 13, 2013 by TW_WebMap
The same code works great on all of our computers, except one.  It runs SingleOutputMapAlgebra_sa from a VB-scripted Add-In, and throws an error.  I can find it in the ArcToolbox Results, and I can run it again from that prompt, where it says "Succeeded, elapsed time 0.0 seconds", and the output file does not exist.

I just went to the trouble to uninstall and reinstall ArcMap and Spatial Analyst, and it behaves exactly the same.

When I run Raster Calculator from ArcToolbox with the exact same input, it works. 

Any clue?