https://bugs.winehq.org/show_bug.cgi?id=54143
--- Comment #14 from David dav75uk@yahoo.co.uk --- Yes I think I'm happy with this being a chessbase bug. Unfortunately the windows laptop doesn't support 4K displays so I can't see it on 4K, but I can make a larger than display window and while it's not 4K, I got the arrow head to be much bigger in proportion to the stick (looks even worse in 4K), similarly for a very small board the arrow head is tiny. Looks like poor code on chessbase's side (not a surprise) and explains why it's not seen on CBReader14 (it's been since fixed).
I'm happy for this to be closed.