Thanks for the quick replies guys. This forum is an awsome resorce!! First I changed to another old project, ... no change. then I renamed reaper.ini file to reaper.bak. Then started Reaper again, reentered the audiodata in preference and.... woilla it worked. Both problems dissapered. So to me it seems that there are some reaper preferences, or rather combination of preferences that Reaper does not like. Which? - I have no idea.