Where is your catalog stored, What folder (Which is also the location of the Preview Cache folder)?
Could be it is set to Read Only and needs to be set to Read & Write in the permissions.
Oh and how do you like the Surface Book?
The photos and catalog are stored in a folder on my C: drive.
It is not set to read-only, in fact it works most of the time.
However, that folder is the Google Drive folder.
Surface Book: I'm still learning to use it, but it really does everything quite well. Detachable screen is an ingenius design.