Improper dialogue window behavior when talking to creatures
Attempting to scroll the dialogue window when in conversation with a non-standard NPC such as Dagoth Gares, Vivec, Creeper and potentially others will result in improper behavior.
Attached is an attempt to show the problem with before-and-after shots. It is most clearly seen in the Vivec example: after clicking the navigation bar to an earlier point in the dialogue, the text itself has not reacted at all save for the line of text after taking the first screenshot. It takes several seconds longer for it to "jump" to the correct spot.
I would guess the thing these characters have in common is that they are not considered conventional NPCs by the game internally.
I have reproduced this consistently by speaking to Vivec, Yagrum Bagarn and Creeper.
Using OpenMW 0.37.0 on Windows 7
(RM-3125 from redmine: created on 2016-01-05 by August Avatar, , closed on 2016-01-05 by scrawl .)