I'd like to take this opportunity to welcome you to the forums and say that I'm really sorry to hear that you've been experiencing some issues with your Catch Up TV service.
I've run some testing on your TiVo® and can see no reason why you shouldn't be able to view catch up programmes. Could you please let me know if you're still experiencing this issue. If you are, could you also let me know the error message you get when you attempt to view any shows.
I'd also advise you to power off the TiVo® for about 5 minutes - by switching off at the socket, once you power it back on, please wait up to 15 minutes to try accessing on demand content. Powering off the TiVo® does force it to renegotiate a connection to the service, which a lot of the time does fix issues like this.