Hi,
A good start would be to have a look in the client logs. You should be able to get them by hitting F12 while having the main client window open, more information here: https://doc.owncloud.org/desktop/2.5/troubleshooting.html#obtaining-the-client-log-file
Also which version of the client are you using? This post template, when creating a new topic is really there to be filled out, so we have all information in order to be able to help you as fast as possible.
Thanks,
nice information. So it looks like the permission issues are originating from the operating system and there is not much the owncloud client can do or am i wrong?