With remote control of macOS 10.15.7 (Catalina): it's possible to scroll with a scroll wheel.
However, as far as I can tell, it's impossible to make traditional (left click-and-drag) use of scrollers.
Then when (for example) the macOS menu bar is out of sight, it's impossible to scroll up to regain sight.
% pkg query '%o %v %R' tightvnc
net/tightvnc 1.3.10_6 FreeBSD
% date ; uname -KUv
Mon 19 Jul 2021 19:09:37 BST
FreeBSD 14.0-CURRENT #100 main-n247798-f39dd6a9784: Thu Jul 8 07:38:23 BST 2021 root@mowa219-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG 1400025 1400025
Not a bug?
> … I believe the scrollbars are standard UNIX/X11 style.
> So you can click and drag with middle mouse button. …
I had no idea (middle click seems non-standard to me) …
BTW, if you have no reasons to stick on TightVNC, can you try net/tigervnc-client instead?
It looks not a bug and TightVNC is no longer developed. The last release was more than 10 years ago.
Thanks, I'll try that.