I have recently installed FrameMaker 11 (v11.0.0.380) and have created a book with several files and a TOC. I am working on a network (I've tried both wired and wireless connections) and have the same problem: When I try to save a file, most of the time I get an error message that FM cannot save the file to the disk. It lists the file name, but adds a 3-character file exension after ".fm" at the end of the file name. Each time I try to save, the file extra file extension changes somewhat randomly. I can do a "save as" and save to my laptop's hard drive (most of the time) and, very occasionally, I can actually save the file to the network drive if I work in another application and come back to FM and *immediately* try to save a file.
I am using Windows Professional with Service Pack 1 on a Dell laptop.