I think the FunCube uses the built-in audio to get/send data, is that right? If so, then I think even 3.5.1 won't work with it yet. There's a branch of GNU Radio in my GR-dev area with a potential fix for the audio issue, but TTBOMK we've never had confirmation from anyone except me that it works. You can download the patch, or view my branch -- and, please do look at those & see if they work for you. If so, then please email the GR list to tell them so & see if we can get this branch committed.
On this ticket's front, I won't have time to address it for another month or so, just too much in my queue right now. I will get to it once my "had to be done yesterday" queue is executed. Also, in order to get 64-bit wx, you need to go with the wxWidgets-devel and py27-wxpython-devel ports; I'm actually trying them out this morning with GNU Radio from the GIT master. That said, I would advise you to go with the Qt interface if at all possible since it is faster, looks nicer, and is more robust overall.
