The lines in the corner are not there for me. That was the first thing I tried to do when the Go Advanced message box shrunk.For the others who see the page looking strange (broken css) - are you guys using the classic (light - blue/white) skin as well?
As for the editor mode in the light classic skin, @redhousenine - you should have a couple lines in the bottom right hand corner of the editor box that indicates you can enlarge it:
View attachment 192994
Could you see if clearing your cache/cookies and refreshing your page helps restore this function? If it persists, what device/browser are you using? Can you see if trying on another browser brings that back? The more details (and testing) you can give us, the better we can assist you.
I'm also seeing a corrupt arrow(?) in quoted posts that looks like it's using the graphics from the newer layout. See attachment.
Using Firefox v54 on Windows 10 Pro 64-bit.
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