For about a week dropbox stopped to work properly on all of my Linux computers. There are no Dropbox icons in indicator, dropbox folder sometimes shows sync icons, but usually does not. Reinstalling dropbox, or even the whole system didn't help. On one of my Windows computers folder sync icons are missing too. Does anybody have similar problems recently? Did someone work this around?
Please see a forum post regarding a similar issue: Dropbox won't start anymore
Should that not resolve your problem, you may have an issue with your installation files.
Here is a potential, not guaranteed, fix I found online that resets the service should it fail to load properly, or stop(by my understanding). I have not used the software, and cannot verify its functionality, but it's an option.:
Also, this link may prove useful: [SOLVED] Problem (re)installing Dropbox
It discusses a similar issue, with dropbox no working/starting properly. Their fix was to find an alternative to reinstall to bypass an error(reinstall issues may not be related to your issue). So, my understanding of cause would be that there is an issue somewhere with the update process where dropbox is concerned, as I have seem multiple pages listing issues with Dropbox after updating.
You can try to reinstall dropbox. This fixed it like a charm for me:
sudo rm -rf /var/lib/dropbox/.dropbox-dist dropbox start -i