Not strictly C++ related, but I’ve just wasted a heap of time trying to track down why the Generate Project Files command is silently failing for some of my 4.16 projects.
Turns out it’s because of dependencies on plugins that are not yet installed for 4.16 (which makes sense and was the case with previous versions too) but changes to UBT in 4.16 seem to have resulted in the error dialog not being shown, so you just get a silent failure.
So, for anyone experiencing the same issue, remember that the likely cause is plugin references inside your .uproject file. If you disable them there until the 4.16 plugin is available, you should be able to generate the project files.