The difference between both screenshots is that when I can see what I'm typing there is a description saying "A descriptive title for your group listing" and when I can't see what I'm typing there is nothing there. I can still type and list but can't see what I'm typing...

https://ibb.co/F432StR

https://ibb.co/vxCHdwJ

Last but not least BugSack doesn't show any errors and the issue happens randomly (not always). With the addon disabled never happens

What addon are you using to skin your UI?

I use Skinner for a few years now

Do you have an authenticator on your account?

I am unable to replicate the issue on my end (even with nothing but skinner and LFM+ installed.) However, I expect this is due to how the skinning addon is setting text/transparency for some UI elements and no directly related to LFM+. I am going to close this issue for now. If you are able to provide steps to reproduce the issue reliably, please re-open this issue.

Yes, I do use/have an Authenticator and no worries about the issue. :-)