Item details are not updated when using arrow keys for browsing the items (UP / DOWN). Clicking rows with mouse works properly and e.g. Enable snipe + my bid updates ok.

This is a known issue (the same thing with Groups as well).
Unfortunately, nobody showed enough interest for the Mac OS X app, so it was set on a lower priority for now.
There is a work still done on it, but without any specific ETA or anything like that.