I'm trying to use Application.Caller to determine if VBA or a cell has called
my UDF. However, when called from the worksheet in a particular UDF,
Application.Caller = -1711800260 and its TypeName is Double. However, when I
send Application.Caller to an IsRange function, it is passed as a valid range.

When I type in the Immediate window Application.Caller.Columns.Count, it
returns the 'Object Required' error. I don't understand it. Has anyone else
had this problem/

Thanks,
Matthew Pfluger