I organized a massive amount of files on the desktop app, but sync seems to have stopped.

A reinstall wont change any data as long as you do it as a reinstall and literally download from http://www.dropbox.com/downloading and run it on the device. 

In future what its worth doing if you ever need to huge changes like this is pause/close Dropbox, do the moving around and then restart it - that way it plays nicely. 

thank you for your quick reply – I will try this when back at my iMac later today.
meanwhile, I will take note of pausing/closing if I do more of this activity.
in fact, I've temporarily quit DropBox on my MacBook Air until my iMac gets to sync – don't want to create more challenges in this sync. :-)

Hey shelley241! Did you end up working on your iMac again? If yes, did your updates sync to the Dropbox website, or are you still having an issue?

Hi Nancy. Thank you for jumping in. I have held off taking action today and did a bit more research.
1) it seems a "Advanced Reinstall" is in order from a url I read on the DropBox Community or how too. that also alerted that there may be conflicts to resolve.
2) if there are conflicts or if something goes wrong, i want to make a file directory with all the folders and subfolders expanded of my DropBox as it sits now in my Library/CloudStorage. the best way is to use Terminal on the Mac  and I'm learning the correct script to do so.

Any of your thoughts and/or direction with specifics would be most appreciated. (As mentioned his is a massive amount of info, approximately 9GB. Although the folders moved around and renamed are only a portion of that, maybe half or more, they are the more critically important data that I use daily and need for a reliable archive.)

Thanks in advance. Shelley

Thanks. Will do. 
I am noticing that online the folder directory is matching my Desktops. It may be that this is taking an incredibly longer time than I thought.