Cause

Console hangs - but all other operations are working, including rlogin(1) and telnet(1). Rebooting the system (via a remote shell) clears the problem.

This problem occurs if another window is opened with the -C option, causing the console to hang. The other window could be another cmdtool window, shelltool window, or even an xterm window. Only one console window can be active at a time.