Issues automatically analyzing full playlists with rekordbox 6

So I recently had to reorganize my entire music collection from scratch into playlists on a new pc. I made the playlists in iTunes originally and then figured I'd just drop them into rekordbox from the iTunes drop down in Export mode. The first playlist worked fine, I dropped the entire playlist from iTunes into rekordbox and every single track analyzed consecutively and automatically, roughly 2500 tracks. 

However, as soon as I did the same with a second playlist, the auto analyzing stopped. It still says Analyzing: x amount of tracks on the bottom status bar but the tracks aren't actually analyzing automatically, just stuck at 0%. I can manage to get just a few to analyze at a time by dragging tracks up top into the player, but they stop analyzing after precisely 5 tracks and then get stuck at 0% again. Is this a bug or am I missing something? I haven't changed any settings since the original playlist which worked fine.

Not sure if this is relevant but I also got an import log message originally saying a couple of the tracks from the second playlist couldn't be analyzed, so I got rid of those tracks and tried again. It didn't seem to have any bearing on the issue i'm having though. Any help would be much appreciated.