On multiple systems, with more or less standard make.conf values, I have found that xscreensaver (or XFree86 I suppose) is not trapping <Alt><Ctrl><Backspace> and hence does not provide the expected security. IT drops me into whatever user's console started X and I now get the account. Reproducible: Always Steps to Reproduce: 1. simply hit <Alt><Ctrl><Backspace> Actual Results: console access Expected Results: Screen should remain locked. Severity is normal or extrememly severe, based on your point of view I suppose.
*** This bug has been marked as a duplicate of 33530 ***
OK, so I see this is well known and I guess that means it's not a bug. Sorry. Mark it closed.