I like Siptv, but it has too many bugs like this (and the EPG doesn't update either).
However, I wouldn't touch smarters either (I'm a pernickety get), it's incredibly poorly developed and not well optimised for anything its been shoved on to. Maybe that's just me but I've never had any luck with it. Can't even use numbers to change channel, come on. Try xc as baz said or Tivimate, which is well worth the money.
Each to their own!
Florian