PVR will not run for me

[Michael Mayne]

Hi,
I've been using get_iplayer under Windows 7 x64 for a year or so downloading
radio and TV manually but I've never managed to get the command line PVR to
work.  Yes I know it sounds odd. Here's what I do. Can you tell me what I'm
doing wrong?

get_iplayer --pvr-add "do androids dream of electric sheep" --type=radio
--modes flashaacstd,flashaaclow --aactomp3

then:

get_iplayer --pvr

It echoes:
Running PVR Searches:

then nothing else

What am I missing?
I can download the above programme manually no problem.

Thanks
Michael