I was just going through Visual Studio Mac key bindings setting things up exactly as I like them and found I couldn't create a binding for Cmd+Shift+F (to Find In Files). The binding window shows the Cmd+Shift symbols but clears as soon as I hit the F key.
I thought perhaps some other app or system settings might be bound to that key, but can't find anything like that. Also, there doesn't appear to be any other conflicts in the key preferences. Cmd+Shift+[anyotherkey] works fine.
So... I manually edited the key bindings file and added it that way and it shows up in preferences now, but still doesn't work.
What I did notice though is if I hit Ctrl+F to bring up the Find Text popup, then press escape, then press Cmd+Shift+F it does work. If I then press escape in Find in Files and then press Cmd+Shift+F and again it doesn't work.