Problems with downloading anything on OD - technical fault 10

Hi. I have recently add a second HD+ box to my bedroom. All is working well: I can download programs, HD channels work, etc... I manually set up my router and it shows it working, but when I attempt to download 'ANY' programs it gets to 4-5% and then just abruptly stops: it returns with the aforementioned 'technical fault 10'. I have tried Skyt Plan Rebuilder, but nothing works.
Someone set something about downloading a utility to if your signal is being compromised by another router, or something.

Any help would be great as I want to download catch-up, as it's brilliant.

Thanks.

:)