The error you describe is a bug. It is already fixed in the source you can get from the Phex CVS.
A new release will be made soon.

Hashing 18GB takes a long long time. You should maybe not share more then 2000 to 5000 files. This might create performance problems. It should not be a problem if you share less files. Just that it takes long to hash them.
Each file is only hashed once and the hash is stored. On next restart of Phex it should be available right away.

Gregor

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