Some layout damage to the MKVToolNix Downloads page and a missing Troubleshooting page
Not a MKVToolNix bug itself but some damage to the MKVToolNix downloads page layout:
Probably a missing [ in the template. While checking if the issue only affects the "Downloads" page I also noticed that the page linked under "Troubleshooting" has gone missing: https://mkvtoolnix-releases.bunkus.org/troubleshooting