Stuck Stuck Stuck :s

[Foo_Fighter]

Hey all im a bit stuck in the part of the game just after u lose all your weapons and all u have is the grav gun ,, and heres the thing, after ive dispatched all the enemys i dont know where 2 go??? there is a small fence i would normally jump over but i cant jump anymore !!!!!! dunno if this is a bug or part of the game.Anyway i would appreciate any input cheers
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[fookhar]

You should be able to jump. At some places you have to grab the energy bubbles running in the vertical energy sources, and destroy something with them.

 

[Foo_Fighter]

Thanx for the help but it turned out 2 be a bug so i restarted from an earlier save and would u believe it i could jump again , finished it now and truly baffled by the ending :s