The recently marked stable screen-4.0.1 ebuild does a bad chmod 0777 of /var/run/screen. screen wants mode 0775 and you can't resume/use/whatever it unless you change the dir mode, or actually erase it since screen makes it on it's own with the right mode if it isn't there (just hope there were no screens running).
If upgrading it actually breaks the working screen... important stuff for server-land i think :)
Yep. Just ran into this and did a quick search for screen bugs.
chmod 0775 does indeed fix.
Fixed in CVS. Please sync in a bit, re-emerge, and confirm
*** Bug 33819 has been marked as a duplicate of this bug. ***
Works fine now, thanks.
But it wants 777 now :-(
$ screen -ls
Directory '/var/run/screen' must have mode 777.
*** Bug 34884 has been marked as a duplicate of this bug. ***