Comment 2 for bug 1666006

I also confirm this.
in previous vesions the dialog defaults to no theme selected as first entry.
looks like it now selects the first theme by default, rather than a 0 or nul entry.
you can explicitly delete and save song, but selecting any other diolog box before saving song causes first theme in list to be selected again.

On theme drop down in dialog no longer a blank entry at top of list which had the effect previously of 'use default'

Could this be as a result of input validation?