That's interesting. It seems like, for whatever reason, the copy is just not working for this specific record set.
Can you change the output format to text? It's possible that this will fail with an exception, which might provide a better clue.
How big is the record set? If it's a particularly large record set that might be a clue but I'm pretty sure I've Copied large (tens of thousands) of records into the clipboard before.
If the size isn't a factor (which I doubt) I'd probably start by removing columns from the record set (say 2 or 3 at a time) and see if that works. Hopefully that will help narrow it down to one column.
If you can narrow it to one column then, assuming the data isn't sensitive, if you could copy it into a notepad document and send it to us (support@sqldbcontrol.com) then we could have a look at it. For the purpose of copying it into notepad, I suggest you change the output mode to text and the run the query. The data type of the column will also be useful.
SQLDBcontrol Support
support@sqldbcontrol.com