Please help!

I have the last version of community builder, sh404sef and k2… in fresh joomla 2.5 installation… If in k2 parameters advanced, I enabled Community builder integration, the RSS feed not working…

if not active integration or clean urls in sh404sef all goes well

Chat jbolo stops working too if active integration…

I'm desperate 3 months with the problem, I thought that component updates would solve the problem ... I have the latest version of sh404sef, cb no, I have the 1.8.1 I will update to 1.9 right now and k2 2.6.2 in joomla 2.5.8

what I can do? help!