I had this problem - also because of a break-in, and solved it by purchasing a new vent window latch.
This led to problem #2 the stripping of one of the captive nuts that holds the glass in place to the frame. So be careful when tightening these screws.

Also check the vent window frame for straightness - these can get bent when people use the old "screwdriver through the vent window" trick to open it. It does not take much to cause wind whistling.

Todd