Dropbox won't start after moving location of user folder

Hi all

I have a mid 2011 iMac running latest version of Mavericks.

I recently purchased an external thunderbolt SSD and cloned my boot HD to it, excluding the user folders as these are too big for the SSD and will remain on the internal HDD, and made it the start disk. Then, once booted with the SSD, I went into users settings and mapped my user to the user folder location on the internal HDD. I then rebooted.

After the reboot everything is working just fine with the exception of Dropbox which first asks for my Mac user account password and then returns the following error and closes the app:

Couldn't start Dropbox

This is usually because of permissions error. Errors can also be caused by your home folder being stored on a network share.

I've searched everywhere for a solution and can't find one. Most solutions I see involve going into the preferences in the Dropbox application and clicking the button to repair permissions, but I can't get to that because the application just quits.

If I reboot using the internal HDD again I can get the application to load just fine.

Anyone know how to fix this?

Thanks

Steve