Hey Sascha,
We’re finding the same thing. We’re also finding that even when you don’t remove that second monitor the workspaces aren’t remembering every palettes properly (preset ones included).
The whole point of the MBP is that you can work on the run with one screen and then set up properly with a second monitor, hit your “twin” workspace and have (in our case) the timeline fill that second monitor. But what a pain when you go back to a single screen and hit your “single” preset and you can’t get that timeline to show up anywhere (or anywhere where you can grab the top of it) on the main screen.
We’ve also been mourning the loss of the green maximize button on the timeline palette. I guess they figured that if they made the minimize and close buttons small enough we wouldn’t notice.
Let me know if you find the answer to the workspaces as it’s been bugging us for way too long now.