I apologize if this has been discussed before, I searched for a while, and did not find anything, but it seems like it might be a common problem.
Clicking on the seek bar doesn't allow you to skip less than several seconds from the current position of the bar. Trying to do so will only cause the bar to jump back a fraction of a second and then continue playing. I.e., if the track is currently at 0:31, then I will be able to jump forward to (approximately) 0:35 or further or backward to (approximately) 0:26 or earlier, but not anywhere in between.
This behavior is the same on both skinned and non-skinned versions.