Using Events + breaks Developers Custom Fields plugin

A very strange issue; by activating the Events + plugin I no longer get back all the content when editing an entry created by Developers Custom Fields!

To recreate:
- have Events + deactivated
- create a simple Custom Fields content type
- add a post with above type with some content
- activate Events +
- edit the above post
- about 50% of the content doesn't come back, random items each time

Any idea on why it might be clashing/causing the issue?