There are two crash reason:
1.) The first class of crashes come from the HexEditor plugin... so just disable/remove the HexEditor plugin if you don't need it. But I also believe this crash was fixed recently in SVN. So an update to a more recent nicghtly might work, too
Indeed, it seems that using the arrow keys in HexEditor is now causing a crash (using SVN 5154) I've reported it on the HexEditor plugin thread, so hopefully byo can take a look at that.
2.) The second one is more difficult. I experience the same from time to time and it goes to:
wxProcess::IsInputAvailable (which wxWidgets)
PipedProcess::HasInput (which is C::B)
and happens on "massive" compiler output parsing.
We are aware of this (Yiannis - remember our chat recently?!) but this is really hard to track down. For now you could try to disable/remove the CodeCompletion plugin (but that's probably not the cause) to get rid of this until we find the reason for this and thus a fix.
I'll keep tabs on when I see this occur, and if there is any predictability in terms of reproducing the error, I will let you know.