When you set up the Slingbox again, did you find the model number of the converter box that Time Warner gave you in the setup? Did you also place the Emitter cables in front of the Converter box IR senor? If not, that will be the reason why the channels do not change.
If you can not find the model number, meaning it is not listed in the setup, you can go to community.sling.com and request a remote to be built.
Hope this helps!!!
Sling Media Moderation Team