Well SVT is updating their site all the time, possibly to make it "cooler" and also to make it suited for tablets and such, I guess.
So software that relies on parsing specific stuff in a specific webpage will have trouble whenever these changes are published.
As an example I have had my Pi running 24/7 for a few months and lately I could not even get a listing of stuff available on SVTplay.
So a few days ago I plugged in a keyboard and a mouse into the Pi and restarted it in order for it to update itself.
Which it also did, but it took a loooong time.
But now I am again able to list the available programs alphabetically (which normally is the only function I use).
As long as SVTplay does not publish a non-varying API for people who want to code for their site there is nothing else one can do than wait for the plugin author to jump to the change and modify his plugin....
BTW, I asked SVT for an API earlier this year but they said that was not in their plans.