I have used EncFS and MacFUSE to encrypt my "~/Library/Application Support" directory on MacOS X (10.6.8). I'm attempting to use the latest version (0.3.23) of the official client. However, when I attempt to start the client, I get the following error:

EXCEPTION: 22DbRunRecoveryException
DbEnv::open: DB_RUNRECOVERY: Fatal error, run
database recovery
bitcoin in AppInit()

By experimentation, I have found that the trouble file is wallet.dat. All the other files can be encrypted without a problem. The exact encryption scheme is that Application Support is symlinked to ~/.crypt/Library/Application Support, where ~/.crypt is an EncFS mount. Other applications work fine with this (with the notable exception of the App Store).

This happens both with a clean startup and a pre-existing wallet.