Boostnote: 0.8.11 (I also noticed this in 0.8.10 and maybe it was introduced in 0.8.10 or in a recent previous version).
Platform: Ubuntu 16.04 64bit.
Hi @MakisH , thanks for your reporting!
It did not reproduce in my dev environment.
Boostnote v0.8.11 / macOS 10.12.3
Would you please attach a movie or gif?
This seems to be the same issue discussed in #170
I can also reproduce it.
Here is a short video:

Now that I see #170 closer, it looks like it's the same or very similar issue. Except that for me scrolling works in editing mode.
Thanks for your cooperation @MakisH ! I will fix it.
Hi, any updates on this? :)
I still have this issue in 0.8.15. I think this is an important issue, because it occurs almost every time a user edits a note (at least for my setup).
I noticed that you try to draw attention to some issues with the "Hacktoberfest" label. I suggest that you draw also some attention on this issue with this tag.
For now I have a quick-n-dirty fix that I use as a fast "refresh" mechanism. You need to have at least two notes in the folder for this to work.
Ctrl + WCtrl + J then Ctrl + K. This will take you to the next and then back to your current note quickly, forcing the refresh. You can leave your finger on the Ctrl key and just hit J then K in quick succession.Granted, this does not fix the issue at hand. It is, however, a workable alternative for the time being.
I'm sorry to have kept you guys waiting so long in the wrong UX.
I've fixed it just now. #1149
We will update to v0.8.17 in this week. Thank you for waiting!
v0.8.17 is out!
@kazup01: Almost there...! Scrolling is working, however I get two scrollbar thumbs after exiting the edit mode:

Maybe related to #1174, #1175, #1091.
Thanks @MakisH , I will fix it.
Hi @MakisH , how about this layout?
https://github.com/BoostIO/Boostnote/issues/1173#issuecomment-346989681
@kazup01 I am not sure I understand what I should see. The problem I mentioned above is with the scrollbars, not with the layout. :-) As soon as the scrollbar is ok, everything else is another issue.
@kazup01 I'm not sure what the status is on this, but I just installed 0.8.19 and got the same issue MakisH is talking about. It looks like the scrollbar from the edit mode is still visible in the preview mode (but, we can use the scroll wheel now!!!).
Here's what I mean for visual reference. (Red = edit scrollbar, Green = preview scrollbar)
In edit mode:

In preview mode (scrolled to top):

In preview mode (scrolled to bottom):

I hope this helped clarify what the issue was. Thanks for all of your hard work!
In 0.8.20 on Ubuntu it looks mostly fixed for me! The underlying scrollbar is still shown in the beginning, but disappears instantly after I start scrolling.
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Thanks for your cooperation @MakisH ! I will fix it.