Password box invisible in multi-user setup about mdm

[xenopeek]

Linux Mint 19.1 MATE doesn't use MDM as display manager, it uses LightDM (from the Ubuntu 18.04 repo). Can you confirm you have indeed replaced LightDM with MDM? If so, please upload the photo on an image sharing site like https://imgur.com/ and post the link here.

If you made a mistake and you're using LightDM then I'd ask if you could reproduce this with Ubuntu 18.04 VM. If it's not reproducible on that—making it suspect something on Linux Mint end (the theme?) causes this—I'd suggest to make a new issue on https://github.com/linuxmint/linuxmint. If you can reproduce it on Ubuntu 18.04 VM I'd suggest to file issue on LightDM for that.

[ewangi]

Thanks for replying xenopeek. All I can say is drat - I had forgotten that Mint now uses LightDM, which indeed I am also using. I'll load an Ubuntu 18.04 VM as advised and see if I can replicate the issue.

[ewangi]

I've just tested this on a fully updated Ubuntu 18.04.1 MATE VM and the issue doesn't occur when the steps in the opening post are carried out. I'll create a new issue as suggested. Closing this one with my apologies that it has nothing to do with mdm...