Files silenty disappear (no corruption) 1.6.15

Hi

Reporting a strange incident, one of my subdirectories disappeared from the
repository entirely. When I do a Show Log, I could not see the folder was even
added or deleted.

I had weekly backups so I able to restore and compare them.

- My rev is now 188 (as of today I discovered the problem)

- at rev 98, the log file went blank and the entries of the folder disappeared.

In some backups, the log file was fine and showed the folder files were
modified. However contents still disappeared.

Only an old backup two months ago I restored,the file contents were fine.

- rev 165, the whole log entry disappeared. In some older backups, the log
entry was blank and the Date entry become "(No date)"

svnadmin verify passes without problems on current svn.

I've been using svn for many years, this is a new repository, and first time
I've seen files disappeared without a corrupted repository reported.
Running windows using fs, svn 1.6.15. Client is tortoisesvn 1.6.12
Received on 2011-02-05 10:10:47 CET