Having same issue. Using Indesign CC 2014.2 update, OS X 10.10.3 and any server using a smb, afp, or cifs connection.
I am in a similar situation as well. After a lengthy phone call with Adobe, we came to the conclusion that the new Adobe updated programs are not communicating with networks correctly. Adobe's tech support will have you save to your desktop and deduce that it isn't an Adobe problem. They will also tell you that it's a network/proxy/firewall issue and to have a nice day.
My Illustrator will make AcrXXXXXXXXXX.tmp files and keep them there for one thing. Also Illustrator eps files do not properly save, and InDesign has a saving issue due to the creation of a temp file. It will not allow me to save because the file is in use.
Downgrading your Indesign to 2014.0 will eliminate the saving problem, but it will not allow you to use any CC libraries you've made (small trade off). As for Illustrator, I'm still trying to figure out a reasonable workaround.
Hopefully this info will help.
Right, we discovered the same thing. The prior version of InDesign works fine in Yosemite networks. It's after updating to 2014.2 that the problems arise. Reverting to Mavericks with 2014.2 will also work (the option we went with).
Working locally is not really feasible with our book files, since they need to be shared and moving a book file seems to break all the links to the contained .indd files. Hoping either a Apple or Adobe update can eventually address this issue.
Thank you for the intel on Mavericks, I will talk to my IT department about that option. I hope an update comes too.