I installed KE 8.5.3 on my windows 8.0.
This appens for almost all files that are longer than the view window. I can’t use Komodo edit any more this way.
I searched for this bug and I see that something very similar happened to Komodo IDE users.
My installation is pure, no plugins. I discovered this bug soon after the installations and the first editing.
I had it installed in another Windows 8 (maybe it was KE 8.5.2 but I honestly can’t remember): everything worked fine.