Movienight is a bit special, for some movies subtitles are provided by movienight itself...
Could you check with fiddler if subtitles are (tried to be) fetched for watchseries?
Am I misunderstanding something? That version is from April 2015, and you only just fixed it a little over a month ago, right?
The first thing I did, of course, was checking that I had the latest versions of both subtitledownloader and onlinevideos. I also tried re-installing both from extension manager (with clean cache) - still not working for me.
I thought perhaps you were talking about a pre-release dll...
The issue you're having isn't a bug in the subtitledownloader, but an issue in my site-util dll in onlinevideos.
It would help if you post some debug-logs (at least onlinevideos.log and preferably mediaportal.log)
Ok, it is indeed the same problem as the starter of this thread had.
The problem here is that it didn't (yet) auto-updated the siteutil dlls, but this time it did update things.
So now (if my assumptions are correct) you should be able to configure the site (in MP configuration) to use subtitles.