Error, "Access Violation in module 'user32.dll'.", when the Dock Site for the Data Grid is set to (4232295)

After setting the Dock Site for the Data Grid to the 'Right' and then running a query in the Toad Editor, the following error occurs:

Access violation at address 7E429C7F in module 'user32.dll'. Write of address 0013F7E4

Steps to replicate the error:

1. In Toad, right-click any blank area of the Editor and go to Desktop Panels | Configure Desktop Layout.
2. In the Desktop Panels window change the Dock Site to 'Right' for Data Grid only.
3. Click OK.
4. Type a simple query like "SELECT * FROM dual" and run it. It should work without errors.
5. Now, unpin the Data Grid so it auto-hides and then re-run the query and the Access Violation error occurs.
6. Without closing Toad when the error appears, re-run the query and it works, but re-run it a third time the Access Violation error occurs again.

NOTE: The error occurs every other time the query is ran.