I connect to a SQL Server 2008 R2 standard edition sp 2 .
I select a table in oblect Explorer and double click on. At this point I obtain the error.
I attach screenshot to show it :
This happen only the first time I double click on a table.
I press OK and I retype double click on the same table and the modify/alter table dialog appear without problems.
All is OK until I close TOAD.
If I close TOAD and re-do the same steps the problem is the same.
I stay tune for your consideration,