1. You run TrueCrypt as before, and once you finally remember your passphrase and type it correctly, you get an error: “the MacFUSE file system is not available (71)”
2. You look around and you still have /usr/local/lib/*fuse*.so etc., in addition to /Library/Filesystems/fusefs.fs
3. Your MacFuse control panel in System Preferences still exists (but the “uninstall” button doesn’t seem to work!). Also, the script which that button runs, /Library/Filesystems/fusefs.fs/Support/uninstall-macfuse-core.sh — that doesn’t work either (run with sudo).
4. You’ve tried installing “fuse4x” and “fuse4x-kext” from MacPorts, but still nothing.
What I did:
1. Remove MacFUSE manually, completely, using the list of installed files at http://code.google.com/p/macfuse/wiki/FAQ
MacFUSE file system bundle (/Library/Filesystems/fusefs.fs)
MacFUSE Objective-C framework (/Library/Frameworks/MacFUSE.framework)
MacFUSE C-based libraries (/usr/local/lib/*fuse*.dylib) and headers (/usr/local/include/fuse*)
MacFUSE preference pane (/Library/PreferencePanes/MacFUSE.prefPane)
MacFUSE project templates for Xcode (/Library/Application Support/Developer/Shared/Xcode/Project Templates/MacFUSE)
2. Remove /Applications/TrueCrypt.app
3. port uninstall fuse4x and fuse4x-kext
4. Reboot. (Might not be necessary but can’t hurt here.)
5. port install fuse4x fuse4x-kext
6. Reinstall truecrypt (you might need to option-right-click to bypass the security check). Note that installing truecrypt, I believe, re-links the TC binary against the fuse libraries that you just re-installed using MacPorts, so you end up with a different TC binary than before.
7. Run TrueCrypt.app again and hope that it all worked…