Trouble registering after buddypress and pro update

[accessart]

Hi our users on htttp://www.accessart.org.uk/studioproject are having trouble registering after we update to buddypress 1.2.6 and the latest s2member pro. when trying to register users are continually asked for lower case username etc, and even then never lets them register... It worked fine before

Help pls! Many thanks
Paula