[Discuss-gnuradio] Weird WX scope problem

[Gregory Maxwell]

Running the current SVN I'm having a problem with apps that display
multiple scopes (usrp_nbfm_rcv.py) for example.  What happens is that
the application will update only a single scope at a time. One scope
updates for a couple of seconds then another scope does, in a round
robin fashion. The GUI is mostly unresponsive.  I see no
overflow/underflow, the audio runs fine, only the GUI is screwy.
Switching the app to one scope resolves the problem.  Top is reporting
the app only using ~30% of a cpu on a dual core box.

I had this problem some months previously but it was intermittent and
I thought it might have been some power management glitch slowing down
my system since I was running on a laptop.

I'm at a bit of a loss as to where to begin troubleshooting this. Suggestions?