BUG in 1.4.beta4 *RESOLVED*

It sounds like you are encountering a plugin conflict. Nobody else is reporting this issue and Javascript errors within the form builder are usually always the result of another plugin interfering with the Gravity Forms javascript.

You will need to run a plugin conflict test. It is also possible for your theme to cause conflicts as themes can do everything plugins can do, including cause plugin conflicts.

If you need me to provide directions on how to properly debug a plugin conflict, let me know. It involves deactivating all other plugins, and then testing Gravity Forms. Then activate each plugin one by one and test Gravity Forms after each one until the problem occurs.

It's common for poorly developed plugins to cause other plugins to not work properly when they output javascript code all over the admin instead of only on their plugin admin pages. That it what sounds like is happening here.

Edit a form and when the formbuilder loads view source on that page and look for any JS being output by the gpress plugin (you could probably do a search for gpress on the source code). It is probably outputting Javascript on that page when it should not be. Unfortunately a lot of plugin developers don't follow best practices which includes only outputting JS/CSS/Code on your plugin admin pages and not on other plugin admin pages.