I use WP 3.81 and cforms 14.6. After installing MailPoet I get a white screen in the WP backend. I can only recover it by: deactivating cforms or MailPoet. I switched PHP-safe-Erros on (in Mailpoet advanced panel) but I don't get any error message.
I doubled the memory size but it seems not to be related to that issue.
Any other ideas?