If desktop Screen Resolution is set to medium (125%), some fields are below the line of visibility when opening a Modal Window (e.g. the Compare Data Wizard in Toad for SQL Server). This means that users cannot select all options or see all text in the Modal Windows.
Use Screen Resolution|Appearance and Personalization |Display. Set screen to Smaller- (100%) Default Setting.
Waiting for a fix in furture release of Toad for SQL Server.