I have same problem. Yesterday everything works just fine. Here's an output from terminal:
Loading game from save/quick.sav...
Loading game from //MOD/save/d1_canals_12.HL1...
Error: Material "models/humans/male/pupil_r" uses unknown shader "Eyeball"
Error: Material "models/humans/male/pupil_l" uses unknown shader "Eyeball"
'cfg/motd.txt' not found; not loaded
'cfg/motd_text.txt' not found; not loaded
Warning: using WorldTwoTextureBlend on a non-displacement surface.
Support for this will go away soon.
- Material : nature/blenddirtgrass008b
- Surface center : -13052 15367 -3324
Invalid save, unable to load. Please run "map d1_canals_12" to restart this level manually
This sounds like corrupt savegames, would you mind uploading a copy of your file? Actually, it would be better placed on this bug https://github.com/ValveSoftware/Source-1-Games/issues/555 - i’ll close this as a duplicate.
When trying to load a save file, HL2 will either (1) Try to load and just just go back to the title screen after the load has failed, (2) Freeze while trying to load or (3) Crash when trying to load. I can start new games. 2 days ago, only about 30% of my save files would load. When it couldn't load the other 70%, it would simply go back to the title screen without freezing or crashing. Yesterday, I had no problems with any of my save files. Today, none of my save files will load. It's possible that it's related to a similar problem in HL expansion games on Intel graphics, but I'm not sure. Issue linked below:
https://github.com/ValveSoftware/steam-for-linux/issues/2493
Distro: Arch 64
Computer: Toshiba Satellite M305-S4822.
Processor: Intel Core 2 Duo T5550 / 1.83 GHz ( Dual-Core)
Graphics: Intel GMA X3100