I created 2 block schematic drawings then moved on to create a rack drawing in the same project. I renamed the drawing to a rack name and moved it in the tab order to be my first drawing (this was before I inserted anything into the rack layout drawing in question), SD stopped treating the particular drawing as a Rack drawing instead it treated it as a block schematic. I could not find any MA racks I needed only block schematic parts were available, the only way to solve it was to move the drawing back to it's original space in the tabs order and then all behavior was back to normal again without having to do any other changes.
 I basically did my rack drawings, once finished I moved them in the order before some schematics drawings, but wanted to report this odd behavior. Regards. 

Hi Bear,

Thanks for alerting us to this - it looks like a known bug that was fixed quite a while ago has re-appeared.  We'll investigate and fix again!

For the time being, as a workaround, save and close the project then, when you re-open it, the correct Product Browser will be associated with each drawing tab.

Sorry for the inconvenience this regression has caused.

Kind regards,
Rob Robinson
Stardraw.com

Hi Bear,

I'm pleased to tell you that an update has been published that fixes the issue, whereby changing the order of drawing tabs might lead the Product Browser to show a listing for the wrong drawing type.

The update can be applied by running SD7.3 and, when the Updates Available notice is shown, by clicking on Install Updates.  Alternatively you can select Help | Check for Updates.

Full details of the update can be seen at http://forums.stardraw.com/Topic18191.aspx

Kind regards,
Rob Robinson
Stardraw.com