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If it's the same track it's an odd one. Usually invisible walls come in to play when you make a really tight turn so that the innermost x-section is almost of zero length. Without seeing it the best thing I can some up with is that you can try and rightclick somewhere in the segment with the invisible wall and select Open On Left in the dropdown. Make sure that you don't rightclick on a f-, w- or x-section because that will bring up a different dropdown