Hi Antonin,
Are the .pck files in an svn external directory?
It might also help if you could email your server logs to support@smartbear.com so we could take a look.
To get the server log, go to the "System" link at the bottom on the page (you might have to be an administrator to see that).
In the "Server Backup/Debugging Dump" box at the top of the page, select the following settings:
"Server Logs" => "Include Server Logs"
"File Contents" => "No file content"
"Which Data" => "System configuration only - no review data"
Then click on the "Download Dump File" button. Send us the resulting zip file.
Thanks!