Hi, I'm having similar issue on Debian Wheezy. It seems that screen is not reporting problems as it should in previous versions. For example, during my test for a chroot jailed environment, screen terminates immediately.
On Debian Squeeze, I noticed it was because 'No more PTY's. Sorry could not find a PTY' error was shown, but version 4.1.0~20120320gitdb59704-7 does not show the error message. The PTY issue is offtopic, but screen should report the error which it didn't in this version. Regards, Choong