I finally found the solution to the SourceMod bug that was driving me crazy. Around August, an update came out for TF2 servers that broke the then-current SourceMod, and you couldn’t start the server because it kept throwing a segmentation fault error. Today I finally managed to find a combination of MetaMod and SourceMod that makes the server run normally. I’ve uploaded these to the Downloads page in case anyone needs them. Hallelujah.