Hi there,
I am a product engineer on the Spatial Analyst team, and would like to help get this problem resolved.
GRID rasters are supported by SA tools as both inputs and outputs.It is possible your specific GRID dataset has become corrupt.
I would like to you know which version of ArcMap you are using, how you are running the tool, as well as the environments you are using.
Since you mentioned a particular dataset, setting up a file share so I can test with your data would be the quickest way for me to reproduce the error, so our developers can take a look!
If this interests you, please send me an email at dmelamed@esri.com, and we can set up a file share.
Dana