I am having the same issue, I am wondering if it has to do with cowpatty on BT5 If I take a capture I did with airodump in bt5 and boot with a live CD BT4R1 cowpatty says everything is good and...

That works for sure

navigate to

/pentest/wireless/aircrack-ng

make uninstall
make clean
cd ..

I am noticing a similar issue, I haven't looked too deeply into what is causing this but I have noticed that airmon-zc seems to be working and you may be able to use this in the mean time while...

Thanks for the tip, I had to do this is a previous version but had forgotten what I did.

Take a look at Muts' howto but do this at your own risk like anything else in BT
...