Internal directories (db, hooks) suddenly in working copy / browser view

Dear all,

I'm running two repositories with Subversion 1.2.3 (r15833) and
Apache/2.0.54. Clients range from svn 1.2.3 (Linux) to recent
TortoiseSVN (WinXP). Everything is "authorized users & ssl access only".

In the beginning everything was fine.

Some time ago I noticed that suddenly in the "browser view" (i.e. pointing
Firefox to the repository URL) the main directory of the repository showed
not just my data directories within the subversion structure, but also
"internal" directories and files of the repository (Readme.txt, conf/,
dav/, db/, format, hooks/, locks/)!

Now when I did an update of one of the working copies, these directories
are in my working copy as well. (Though they don't look complete, e.g. the
db directory contains only an empty.)

"svn log" says the directories have been added by a user (who does not
know how the internal structure looks like and has no admin rights on the
server).

A second repository on the same server looks fine.

Do you have any idea what might have happened? Should I worry about this?

More information on request...

Best, Andreas

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