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Half-Life 2 Hints
BUG WARNING
The beginning of the third chapter section ("The New, Improved Gravity Gun") is very buggy. The most common thing that happens is that you can't jump anymore after the "weapon confiscation" force fields let go of you. A less common bug prevents you from ever picking up the super gravity gun from the floor, leaving you totally defenseless.
The best thing to do if this happens is to restore a save from before you entered the third chapter section and play on from there, hoping the bugs don't happen the next time (they probably won't). If you have nothing else to go back to, you could try loading up an autosave that the game made either right before or right after your weapons are confiscated, but the bugs are very likely to happen again if you do this.
If none of that works, then open up the PC Cheat console and type the word "restart" (w/o quotes). That'll restart you at the beginning of the third chapter section, and the bugs may or may not happen again. If they do, try restarting again.
If you don't want to restart, you may be able to fix the problem by using the "sv_gravity" console command. Set sv_gravity to 200 and see if that makes you jump high into the air when you close the console. If so, get the console back up and type: bind space "+jump; sv_gravity 600" (quote marks included) to see if that makes jumping possible again. This works less often than not, however, so you may need to use the "restart" command.