[Stuck On 'please Wait' When Finding A Squad]

CTRL + ALT + DEL does the work.

[Enemies Stopped Spawning During Rank Test]

Today I had the same problem as you. I was also using bow.

Also used my warframe special ability (just to check if I could use it, but missed it on purpose). I also ran out of ammo (resulting of hiding the bow) and killed 2 enemies with one shot (the second killed with the dead body impact), so I think those might be an issues.

 

Definitely some kind of bug.