Hi, thanks for the report!
This doesn't seem to occur on our systems. Do you only get it with OV 3.3? We use Logic 7.0.1 (on Intel and PPC) and OV appears to work perfectly - no explosions here. Are they connected to anything you're doing? Parameter changes? Routing changes? Do you use the internal synth or an external carrier when you get them? Do they happen occasionally, regularly, after a certain time? Only with a specific vocoder sound mode? A specific preset? Project sample rate? We never heard of this problem before and OV 3.3 would never have made it through QA if the problem had occurred during our tests.
Wrt. inserts: I can insert OV on an audio track with no problems - not sure what you're referring to when you say "it still doesn't work as an insert, only as a MIDI controlled FX". Could you describe this in better detail? Here's a screenshot of how I insert the vocoder on a L7 track:

The fact that you don't get any sound at first is that there are no keys selected on the keyboard when you load up OV. Just choose the default preset and you should get an output.
HTH
+Stephan