When you had a previous version of Brainiac Designer installed, under Windows Vista, it might occur that some modified behaviours or workspaces are still the old ones. This is because of the compatibility files.

Open the program folder of your Brainiac Designer installation. Normally that is C:\Program Files\Brainiac Designer.
Click the button "Compatibility Files" to switch to the corresponding folder.

These files are loaded instead of the others. For example if the Design Mode workspace is not included in your list, simply delete this file so the new one is loaded.