the issue doesn’t exist in 4.4. re-analyzing the track while it’s playing fixes it temporarily, but the issue comes back after re-loading the track.
Oh, that doesn't sound good at all. Do you have any more information for us? Does this happen with all files, whether MP3, FLAC, WAV, AAC, AIFF, etc.? Do you edit your tags outside of Traktor? My gut feeling tells me I should generally steer clear of Traktor 4.5 for now. But maybe I'll have time next week to install it on my test machine, and then I'll gladly give you feedback on whether I can reproduce the problem with macOS.
