When I scroll down thou my "Collection" of albums, the scrolling suddenly stops responding. It seems to happen when you don't scroll right after your fist scroll. I use a Macbook Pro trackpad with Mountain Lion installed, it worked fine in Lion.
Thanks for writing in. I haven't been able to reproduce this in the office. How frequently does this occur? And when this happens, is scrolling non-responsive by any means, or just with your track-pad? Next time you see the scroll-bar stop responding, try using the directional keys to scroll, or drag the scroll-bar, and let me know what you find.
Also, I'm a bit confused on your description of when this seems to happen. I'd appreciate it if you could let me know a few more details on how to reproduce the problem.
While I haven't had any issues with it not working, I have found that scrolling is surprisingly "jerky" on the collections page. It isn't very smooth.
I have OS X 10.8 running on a MacBook Pro with Retina display.
We're working on optimizing app fluidity going forward. Thanks for your feedback, and don't hesitate to let us know of any other questions or concerns you might have.