Originally Posted by baeuchlein
One explanation for these problems could be that the scripts used for the mission did not work for you this time. The subtitles displayed when Jonas, the fat merchant, and other people speak in this mission are realized with custom scripts. Most likely, these scripts are also used to let the mission progress in order. This would probably explain why
Jonas is suddenly gone from his hideout before you have completed the objectives with the sphere above the rear entrance of the House of Science(s).
By the way, if you play this mission on easiest difficulty level, the fat merchant near
the stairs most likely will not speak what he would usually speak, but say the line of the female portier instead, stating that all rooms are occupied. I think you can even hear him speak with the female's voice. This appears to be a little bug without any consequences. The fat merchant's sub-quest is simply not available on that difficulty, and he babbles some nonsense then. Just don't heed his words in that case.
If you have an early savegame where you can proceed to anyone (e.g., Jonas, fat merchant, female portier at the bar of the "Stumbled Traveler Inn", ...) whose dialogue lines are subtitled, load this game once more and see whether the subtitles do appear or not. If they don't appear, the malfunctioning of the scripts is already saved in the savegame.
The scripts inside v1.6 of the campaign (which is the newest version published in English) are partially outdated, but so far, I could not trace back any of the missions' problems to that.
Unfortunately, all of this could very well mean that you have to restart the mission from the beginning in order to get the scripts working again.