I've seen an error thrown by two tools (Create Raster Catalog and Clip - but which tools is probably irrelevant) on three Windows XP laptops using a procedure that works fine on three other Windows XP laptops and two Windows Vista laptops.
It occurs after the Search tool (with Tools option) is used to find a tool and then the tool is left clicked on to try and start it.
Instead of starting it the error seen is:
Contains errors that might prevent it from displaying correctly
Error: Invalid Pointer"
Dismising the error shows a little more information...
"The website wants to run the following add-on 'ArcGIS Product Version Library' ..."
When this happens we close ArcMap, re-open it and do the operation again - it seems to work second time, every time.
I've not been able to find any reports of this and am keen to hear anyone's thoughts as to whether what is causing it may be preventable?