/dav does not accept uploads from any domain with domain owner credentials

I am having problems getting dav to work on any domain. Host is Ubuntu 12.04 running latest webmin and virtualmin.

All configuration details seem correct. I can log into the both http://domain/dav and https://domain/dav and see and read the directory contents and files. BUT, I cannot upload any files essentially I get these errors in the Apache Error log. They would normally be related for file and directory permissions but all seem ok. All files are owned by the domain owner as is the /public_html directory that /dav is an alias for and I am authenticating correctly as the domain owner for each domain.

Can anyone suggest a remedy for this as clients want to use webdav (dreamweaver/Nautilus etc.) and this is causing some real headaches that I simply cannot seem o get t work even though everything sees to be automatically configured by vitualmin?

Cheers Spart

[Tue Dec 03 21:19:12 2013] [error] [client 192.168.0.254] Unable to PUT new contents for /dav/index.html. [403, #0] [Tue Dec 03 21:19:12 2013] [error] [client 192.168.0.254] (13)Permission denied: An error occurred while opening a resource. [500, #0]