Hello,
Yes, a SVN client that supports the SVN 1.5 format converts the working copy to SVN 1.5 and the current version of Syncro SVN Client (version 3.2) cannot work on it anymore. We plan to release an official version of Syncro SVN Client with support for SVN 1.5 in about a month.
We have already beta support for SVN 1.5 and if you don't mind working with a beta version please
contact us to give you access to a beta version.
Regards,
Sorin