Is there something in the latest MB update that is making custom posts that don't have any custom fields load a blank page when I click edit? I am running MB 5.10.5 and AIO 1.31.1. In fact, when I try to go into Metabox settings to edit a custom post type, that seems to be missing stuff too.
The custom fields when editing a CPT are displayed properly on my site, screenshot https://imgur.com/AARZKaW
Please try to clear all caches (plugin, browser, hosting ...) then deactivate all plugins except Meta Box, MB AIO, switch to a WordPress theme and check the issue again.
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