Chabs, I've indentified where the problem is in your skin.xml file that's causing the crash for users when they exit playback of recording. I don't know if there are more problems lurking as the line is question is similarly repeated a few times in the XML file. Anyway two things
1) I've got a working skin.xml if anyone wants to test it for SkyQ v1.5 - You can download it from my dropbox at the link below and replace the skin.xml in the SkyQ folder (perhaps people can feedback if they have any other crashes and what they were doing at the time)
2) It maybe something to do with one of the renderers you are using, but saying that, these seem to be consistent between 1.4 and 1.5 so maybe not.
Working skin.xml file can be found here:
https://www.dropbox.com/s/whlnqkx887twloy/skin.xml?dl=0