I've recorded 236 episodes of my podcast, Toronto Mike'd. Once a guest has agreed to visit me, we agree on a day and time and record. Every single time I've dealt directly with the guest, this has gone smoothly. Almost every single time I've dealt with the PR Rep instead of the guest, it's been disastrous.
I'm not referring to times my guest has had to clear their appearance with their organization's PR department. Every guest I've had from the CBC has had to do this and they've all been approved. I'm talking about the few instances I've only corresponded with a PR Rep.