Hi Thomas,
I’m sorry to hear your unable to publish/update post in BoldGrid Post and Page Builder.
Can you ensure that all plugins as well as WordPress core and your Crio Pro WordPress theme are all up to date?
You should also try deactivating all plugins with the exception of BoldGrid related ones and see if it allows you to publish a post after doing so. If that works you know you have a problematic plugin. Activate each of your remaining plugins one by one until you can reproduce the error.
I hope this helps! Please let us know if you have any other questions for us.