I've had this problem myself before.
I solved it by uploading EMU again with DSR Studio 1.3 (i use EMU Gold vers. 8.2, not the latter vers. 8.4), then doing a channel search.
Another way is if you've already saved your channel lists to your pc with an Editor (like Semco Editor 2.04), then these can then be written back to your receiver, and that'll make it work agin.
hope this helps!
Good luck!