Please describe the problem:
It appears possible to make Rhythmbox become non-responsive (crashed) by changing the crossfade duration on the fly to a very small value and skipping to the next track.

Steps to reproduce:
1. start rhythmbox and enable crossfade plugin to 30sec duration
2. queue up some tracks in a playlist (I had repeat and shuffle both enabled)
3. restart rhythmbox
4. play music from the playlist you created earlier
5. change crossfade duration to ~0.5sec (a very low value) while music is playing
6. change to the next track (I clicked the next button)

Actual results:
Rhythmbox becomes non-responsive as soon as you attempt to switch the track. All audio output is stopped immediately on attempting to change the track.

Expected results:
Track is changed with a crossfade equal to the new value of 0.5sec (or whatever other small amount).

Does this happen every time?
Yes.

Other information:
Using rhythmbox-0.11.5 on top of gnome-2.22.1/2 and gstreamer-0.10.19.

I'm running Gentoo ~amd64 so every package on my system should be 'the latest'. I can provide more details of exact versions of other software I have installed, if required.