RE: A Database id problem ?!
Unlikely.
It is always possible that Contact Form 7 didn’t install or update correctly on your site. It’s a general problem with WordPress updates due to the unreliability of internet connections.
Delete the plugin folder at wp-content/plugins/contact-form-7/ using FTP (don’t use Delete option on Plugins page as this may erase all CF7 forms) and install the plugin again.
Could be a JavaScript conflict with either your current WordPress theme or one of the other plugins you are using – see Contact Form 7 Email Issues – there is a link there that covers JavaScript Conflicts.
Step by step approach to finding JavaScript Conflicts
1. Switch temporarily to a WordPress default theme (Twenty Eleven etc.) and see if the problem goes away.
If it does, you’ve most likely got a JavaScript conflict with your current WordPress theme.
If switching to default theme doesn’t help it could be one of the plugins you are using that is causing the problem.
2. Disable all plugins other than Contact Form 7
If doing that solves the problem, you can then add back each item – one by one, until you find the real cause of the problem.
