You only think hammer is freezing
If you ever used dual monitors then listen carefully,
I had this same problem and I think i just might have the solution for you.
Did you ever use DUAL monitors while mapping? If so and you were using hammer on your second screen, there were no problems.
But if you were mapping on a SINGLE monitor hammer wil try to put that screen of WORLD MODELS to the second screen, but there is no second screen and because when the screen is open, you cant acces the rest of hammer, thus makes you think hammer froze.
SOLUTION: When opening world models (when clicking “browse”) hit WIN + [arrow left] or [arrow right] this depends if you had the second monitor right or left, because you want to move that window to you laptot screen wich you are using right now.
If you did not use any second monitor this all time, then i dont have the solution for you,