This worked for me after following the support article a while ago but now it no-longer works even after re-adding with the spotlight enabled option. I'm getting:
bash-3.2# mdutil -i on /Volumes/DropCrypt
Error: unable to perform operation. (-405)
bash-3.2# mdutil -E /Volumes/DropCrypt
Error: unknown indexing state.
Is this caused by Mountain Lion or the version of FUSE or BoxCryptor? It used to work but I'm now running:
OS X 10.8.2
BC 1.0.5 (7)
Is it possible to downgrade anything to get this working again?