In Temple of Uggalepih, right near the entrance where the vines run down the wall, I hit an invisible wall covering the entire path. I called a GM and had them warp me across it, and headed through the temple some more until I hit yet another one. Same vine formation on the wall, minus the flowers. Ended up warping out. I restarted, ran a file check, and it came up clean. Headed back down to check, and the wall was still there. A GM advised me to contact tech support, and they basically said they don't deal with ingame stuff.
Any idea on what I can do/the problem might be? I'm thinking it's probably a broken .dat, but I have no way of identifying what .dat it is.
XI Wiki

