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Are both extended? Have you retrieved the blue portal gun yet?
If one of them is not extended, you can hold control (CRTL) to crouch
Have you tried placing a blue portal on a nearby portal surface? I know for a fact you have access to one. Tell me if it is open.
Once again, what do you do before you wind up in this situation? Do you find yourself here every time?
There should always be at least 1 orange portal active at a time, unless you reached the end.
If you don't see the "yellow" portal, then try placing a blue portal on a nearby surface. If you can see through the blue portal, then there is a "yellow" portal somewhere else, it's only moved to a different place. Otherwise, there's some sort of bug.
There are no mazes in this map, (maze being a series of branching pathways, some of which lead nowhere) but I'm guessing what you're saying is you got turned around?
The final puzzle connects two different chambers together, that's the only place I think you could get a bit turned around. The rest is pretty straight forward.