After a gig this week we found out one very annoying bug, and one feature, which I think is not good anymore since some (awesome) added features in R6.
Running on Win 10.
Bug: When dragging the vertical scrollbar of your deck and while keeping your mouse button pressed, when you move your mouse onto the second screen the pointer appears over the output. Doesn't happen with the horizontal scrollbar. I'm pretty sure we don't want this

Not-so-nice-feature:
I've posted this earlier (in the general forum) and Zoltan replied that this is standard behaviour with al paramaters. Resetting a parameter by right-clicking is indeed a good solution for 1-dimensional parameters (sliders/values).In the timeline (example working on an envelope), when right clicking on left of to the envelope the whole envelope / all your changes disappear.
The problem is that with an envelope you can put quite some work in it to get it right. Having right clicking immediately undo'ing all of the work and no CTRL-Z option is not really user-friendly.
I would suggest changing the default behaviour of resetting a parameter to it's default state to CTRL-2nd mouse click, or something similar if you want to solve this issue globally.
Another option is to have a warning when right clicking on the side of an envelope or any other parameter that can have incremental changes.