I have x68 with MT 5.20, and after some time (about 2 days of uptime) web proxy doesn’t pass traffic any more.
After restart, web proxy doesn’t start automatically. When I open web proxy setting, here is what I see.

After entering port number, checking “Enabled” and applying settings, status is stopped.
I need to restart mikrotik several times, and in some situations this doesn’t help. In that case I downgrade mikrotik to 5.17, upgrade to 5.20, and then it works.
What is wrong?