Lock screen clock has slash in place of colon after marshmallow upgrade.

[tcfulmer]

I've played around with the font but haven't been able to find a resolution. I'm looking for a non-root solution.

 

[SolApathy]

It could be associated with a theme. Have you tried changing the theme to see if that fixes the issues?

Otherwise you could try uninstalling the updates on the lock screen under settings/apps and see if that resolves the issue.

 

[aml1025]

If you choose Themes under Personalize, you can pick all kinds of current lock screens, wallpapers, icon packs, etc.

Here is my current lock screen clock: