So I can say that I'm also experiencing this.

The download is still happening in the background, and it still generates files, but the files are sometimes malformed and all have 840:28:22 as the length of the video and cannot be played back. This seems to happen if a selective clip goes across xx:00 (for example, 01:59 - 02:15)

Otherwise, downloading entire hour bundles still work in the background despite the UI not displaying as such.

Hope this helps.

MAC OS v8.8.5