I am also running FTM16 (16.0.350) on a 64-bit computer. I have 2 issues with it and wonder if you are having the same problems or if there are workarounds:
- it will not print a book
- it will not allow use of web search . . . keeps asking to register and when registration is completed, still keeps asking.

I am running FTM as administrator in compatability mode. Any hints?