Using the Articulations in Cubase, this happens periodically. The lane is set at Legato and the Inspector shows that, too. However, the HSO Viola plays Pizzicato Tight along with the Legato. It starts randomly… I’m not working anywhere near the Viola track. I can’t seem to shut it off unless I mute the sound in the instrument. When I do mute it, the Legato plays normally.
Has anyone had this issue?
Working on the project the next day and everything is fine. 
Last night, every HSO string patch used in the project started playing HT Trills along with the Legato… but I’m guessing it’ll be fine when I get back to the project today.
Pizz is back. Starts playing at one section and then won’t shut off unless I mute it in the instrument. The track contains not erroneous data - I’ve checked everything. It must be the HSO player.
Issues persist with HSO (and now Iconica Sketch) when using the Articulation lanes to control performance.
When building a project, I typically enter everything in midi with scratch tracks for the bass and guitars to be played live afterwords.
Finishing up a mix. The last items worked on (for about a week) were live guitars - didn’t touch any midi. Playing back in the project window, all sounded as I wanted. But when I rendered the project, a violin sounded for about 2 beats after the last hit. I checked the project with playback from the project window and there it was… It was one of the HSO tracks in Halion 7. I checked all the programming and there was nothing there that would cause that. I finally got it working by loading a different violin patch in the slot in H7. It rendered OK.
I contacted Steinberg support again about the issue. The tech was pleasant but dismissive. There was no ‘remote in and have a look’, it was just ‘there’s probably some issue due to some changes you made’ (although it started more than a week after the last time I touched the track). Harumph…
Started a new project with a couple days of work on the midi parts entry and HSO started up again. This time it was back to the original issue I had - playing an articulation that was not called for. This time it was an HSO Viola patch with pizz playing when anything else was called. I changed the patch to no avail. So… I tried the Iconica Sketch Viola, only to find that it doesn’t respond to the crescendo function. I looked in the List Editor and there’s very little info on the Dynamics or Articulation functions in there. So much for trouble shooting.
If I’m the only person in the world experiencing this issue, I guess I should feel special. My next step is to rebuild my project template from scratch again. Maybe there’s something going on in that file.