Hey ive beaten HL2 already and what not, but i was playing it again on Normal difficulty and when i reached the chapter "Our Benefactors" i was no longer able to jump, i could do everything else but jump, luckly i found some use with the items and had to create ways to get over objects, but this really annoyes me the same problem was in "Dark Energy" but in the Chapters before these 2 , there was no problem. i made my jump button "J" but that didnt work and i restarted HL2 and my computer, but same problem i dont know why i would not be able to jump for these last 2 chapters, but i could jump in all of the other chapters. And im positive that this didnt happen when i beat the game earlier this week, and i did beat it again this time but i want to know the problem so i can fix it, any help is appreciated.