I keep my workspace folder in the Dropbox folder so I can use it on different computers. Usually there isn't a problem. Today however I opened Eclipse and found it doesn't show the projects in the package explorer.

I checked and it's set to the correct workspace folder.

I tried to `Import existing projects into workspace`, but Eclipse doesn't allow importing the projects because 'they already exist in the workspace' - even though they don't appear.

Will appreciate your help.