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The only way to further debug this would be to check for plugin and/or theme conflicts. I noticed you are running a bunch of plugins, including multiple types of caching plugins. Depending on how the caching plugin works, this can cause issues with plugins that need live access to the database. It's possible one of these is causing an issue.

I'm not familiar with the caching plugins you are running, W3 Total Cache for instance allows you to whitelist Gravity Forms so it can continue working properly while other things are cached.

You would have to check for theme and plugin conflicts, most likely a plugin conflict.

To test for a theme conflict:

- Activate default Twenty Ten theme
- Check to see if the issue still occurs

If it does not, then something in your theme is causing a conflict with Gravity Forms. If it still happens, follow the steps below to test for plugin conflicts.

To test for a plugin conflict:

- Deactivate ALL plugins
- Activate Gravity Forms
- Check to see if the issue occurs

If it does not, then one of your plugins is causing a conflict with Gravity Forms. To narrow it down follow the steps below:

- Activate each plugin one by one
- Check to see if the issue occurs after each one

One way to do this quickly is to activate plugins in groups of 5 or so. Then when you hit a group of 5 that causes the issue to occur, deactivate the 5 and activate them one by one doing the steps above.

We can't prevent themes or plugins from causing conflicts depending on what they do. This is especially true of caching related issues. Let me know how it goes.