Forum: GNU Radio GNUradio and Windows 7 still need help

I have been running a relatively simple program on my Linux computer but 
when trying to run it on the Windows computer I get the following error:
:Invalid argument
C:\Users\Al\AppData\Roaming\.gnuradio\Prefs\gr_vmcircbuf_default_factory:
No such file or directory
:Invalid argument

The program consists of a File Source going to a Throttle going to both 
a WX GUI FFT Sink and a WX GUI Waterfall Sink. When I run the program 
both the Waterfall and FFT positions come up but only the Waterfall 
actually appears but with nothing happening. If I disable the Waterfall 
Sink then the FFT grid comes up but with nothing happening.  And of 
course the above error message comes up in each case.

Any help would be appreciated.

Many thanks,

Al