We've just updated the membership plugin to version 2.0.5
This version includes some filters for paypal notification and return urls - for those sites that have / had problems with PayPal IPN notifications being returned, these can now be overriden to hardcoded files.
I've also added an experimental 404 override option in this version - set it to Yes and it will display a no access message instead of a 404 when posts aren't displayed, set it to No for the current behaviour to be retained.
The Terms of Service plugin now plays nicely with the membership signup form (the check box was previously ignored).
We've also made an update to the authorize.net gateway.