Ensure you have no active Caps Lock or Shift Lock. (The respective LEDs on the keyboard might not work.)
Perhaps you can do a second logon, via ssh or via remote desktop login (which is XDMCP).
Then you can see the PAM log in the configured syslog file.
Unfortunately Solaris does not log PAM by default.
Or you can kill the CDE session manager, will kill your problematic session.
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