Thank you very much for your quick reply. I tried all your suggestions:
1. The problem persist with all 4 default stylesheets
2. The user guide was not of much help to me as i am not a developer and cannot do html coding
3. I am using the colorway theme from inkthemes and wordpress 3.4.2. I tried increasing the width of the content area by using colorway support. But the problem still persist. content area width doesn't seem to be inhibiting in this case.
Actually, it was working fine with your earlier version. It started only after I updated wp-members to the new version.
Is there any other hints you can provide me to solve this issue?
Many thanks in advance