I have my Photos library hosted on my NAS and access the library between my rMBP 13" and my 2007 iMac. Both are running Yosemite (10.10.3) with the latest versions of Photos. Lately though, regardless of which computer used the library last I have to do a Repair of the library every time I open Photos. Anyone else having any issues like this? Any suggestions on cause or solution? Thanks.