The Half-Life 1 engine, gldsrc, received another update today to address the steady stream of issues that cropped up after last night's update.
This update fixes the "Assert( IsIdxValid(i) )" and then crash errorAll admins should run hldsupdatetool in order to grab this update. More issues, as noted, are still being worked on.
when running a server and fixes a crash on startup under linux if you
had virtual interfaces.
Known bugs that are still being worked on are the setmaster call
stopping server listing and sv_visiblemaxplayers no longer being used.