Maps not loading, freezing up, or crashing issues since Half Life update - possible fix.

[Sgt. Rock]

There seem to be an abnormal amount of map problems, for some people, since the recent Half Life update. If you are having trouble getting maps to load, or maps freezing or crashing, try this: In your Steam Library, right click on Half Life, click on Properties, click on Betas, and select "steam_legacy - Pre-25th Anniversary Build".
Exit and restart DOD. It's not a sure fix, but it might fix the problem.