Not a big issue but in most cases this makes me adjust and re-lock my main screenset (of my self-created project template that I always use) during the course of work. If you want to reproduce the issue, follow these steps:
1. Load the Normal project template (and delete existing tracks if you see them).
2. Load three synths from the Browser, say, SI-Drum Kit, SI-Bass Guitar and SI-Electric Piano, creating either simple instrument tracks or audio/MIDI tracks.
3. Display the property page (plugin window) of only the second synth you loaded (i.e. SI-Bass Guitar).
4. Lock the current screenset ("Main Screenset").
5. Switch to some other screenset and then switch back, and make sure the same synth is displayed (i.e. SI-Bass Guitar).
6. Now, open the Browser's Synth tab and delete the first synth (SI-Drum Kit), with its associated track(s), from the synth rack by right-clicking on it and clicking "Delete Synth."
7. Switch to some other screenset and then switch back.
[Expected Results]
You still see the property page of the same synth (SI-Bass Guitar).
[Actual Results]
You see the property page of the next synth (SI-Electric Piano).
Reported on Nov 23, 2013
Confirmed and submitted to development on Nov 27, 2013