Just read the thread and you'll know it all...
Long version: I wanted to name an ardour-session with "BAND: TITLE".
This was a bad idea, because ardour made strange things with my data. I
found three directories instead of one ("BAND: TITLE", " TITLE" and
"BAND") and the session wasn't able to be recalled.
So, as I'm not using the latest version of ardour (I'm using the
64Studio-version 2.0.3), see this as a warning! If it's not fixed in
ardour 2.2, than it might be a good idea to send a bug-report.
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