We are sorry we were not able to help you in time. In fact our entire support service has been missing for the last 30 days due to company issues. For a very short period we’ve left without any staff to handle requests and it took us some time to resolve this problem. We’ve now managed to restore our service and support will be provided with the normal rate.
About your problem – we cannot see the default OC RewriteBase rule. Not sure this can be the problem in your case, but you definitely need it if you want the SEO urls option to work.