Sorry, I didn't read you post properly. This is a well-known problem and a Forum search on "No manufactures available" would have quickly given you the answer.
Basically a component in your Slingbox has failed. See
Trying to setup my legacy Slingbox HD to work with Verizon Fios.
Get to the Remote Control Setup page, no matter what I enter in the search field for my device I get no options to select from, even entering generic terms like Motorola, Dish. Then when I select next I get the error message:
No exact match found for:
Please try a more generic search on the previous page.
Try the Need help finding your device? Try selecting from our list of supported devices
Selected Cable TV Box
Next box shows "No Manufactures Available"
This is frustrating beyond belief!
In fact, choose any device and you guessed it, you get "No Manufactures Available"
So stuck, can't move forward because of these errors?