Problems with soundfonts in Musescore 2.0 (Revision: 1efc609, Mac OSX 10.9.4)

Hi,

First, this is a much better software than 1.3 - I found that a lot of the durations not adding up in 1.3 have been fixed automatically when opening the old scores.

I did run into a few issues however.
1. Selecting multiple soundfonts seems to be broken for me. It's doing something, but definitely not what I want. As an example adding a guitar soundfont with 3 instrument inside and an accordion soundfont with 5 instruments - between the mixer and the player they get confused. Selecting any guitar plays ok, however selecting the 4th entry would still play the guitar #1 where that is 100% an accordion. The logic seems off, counting the first instrument twice - it plays:
1. Guitar #1 plays ok
2. Guitar #2 plays ok
3. Guitar #3 plays ok
4. Accordion #1 - plays Guitar #1
5. Accordion #2 - plays Guitar #2
6. Accordion #3 - plays Guitar #3
7. Accordion #4 - plays Accordion #1
8. Accordion #5 - plays Accordion #2

So there's no way to play Accordions #3, #4, #5.

Trying to change the order of sf instruments in the synth dialog crashed the app a few times, once I tried to get back to the mixer.

2. Everything is exported in the default piano - even though I've removed it and added new soundfonts. The playback is fine inside Musescore but the exported wav is not.

3. The rendering seemed to sometimes flicker/"jump", oscillating between no space between rows to huge spaces.

I realize this is probably due to the new feature (drag'n'drop the rows) but would it be possible to lock/unlock it?

Thank you,
Sebastian