Edit: This was a problem with the password plugin, not roundcube, have fixed the issue.
with roundcube 0.4 beta installed whenever i send an email to another account of the same domain it does not arrive, however if i send it to an address at another domain the email does arrive.
when sending from another address to the domain it arrives.
strangely enough it worked 100% until friday.
it is definately not a server problem (tested with squirrelmail and emails are working fine, when sending from a client such as thunderbird the emails also work)
is there anything which could be causing this? was all working great until friday
i have tried a complete reinstall and also deleted and recreated the mysql database, still nothing.