Deleted then reinstated Rekordbox folder in Dropbox

Hi - after a day of trying to troubleshoot this on my own, I'm admitting defeat. 

So, basically I deleted my library within RB6 and replaced it with a new library of files run through Platinum Notes. I then decided this had been a mistake so then deleted that library and reimported the original library. I let RB6 do its analysis in full and reinstated thee folders of files that were deleted from my Dropbox Rekordbox folder. I had uploaded a good number of tracks to there. 

I realise this wasn't the smartest thing to do, but now RB6 will not sync any of the filers reinstated in my Dropbox folder. Nada, zip, zilch. I have rebooted, logged in, logged out of both PC, Dropbox apps, the Rekordbox ios app on all my devices and still nothing. I even did a backup of my new (old) library and reinstalled RB6 on my PC. Again, nada.

The sync icon demonstrates it stricks around 2% cloud sync, then progresses to 30% of sdo, then completes - then restarts. Like I say, this was likely inadvisable but we are where we are. I guess I'm wondering whether: would my cue points etc now be lost forever, and also, is it even possible for me to sync the reinstated files? As I say, it's not doing this so far. I have the wrold's worst bandwidth here, so reuploading is ging to be horrendous. 

Thanks for any help...