Fix: If the Desktop icon is grey, then you are not currently connected to the internet.
If you've verified that Dropbox is installed on all of your devices, and that you're online, move on to step 2.
If you've verified that antivirus or security software is not interfering with your sync process, move on to step 13.
Fix: You can use Selective Sync to select only certain files to sync to your computer, but still have them on and on other computers.
Fix: You may be able to help Dropbox sync faster by adjusting your bandwidth settings.
Fix: Add the Dropbox cache folder to an ignore list on your security/antivirus software. Once synced, you should no longer see these warnings or quarantine messages.
Fix: If the addresses are different (look carefully for typos), then you have multiple accounts and your devices will not sync.
Follow these steps to link a computer and other devices to your Dropbox. If your files have not synced after restarting, move on to step 6.