I ran into a bug when going through error locations with Alt + N / Alt + Shift + N.
The feature just stops working altogether, but luckily I was able to find a way to reproduce it.
It only happens if you press one of the key combinations while your build.bat is still running.
A restart of 4coder makes the error go away though.
And just as a side question; should I report bugs here or is there a better way?