Wouldn't you know it.
Just when I thought all the bug bugs had been squashed by the betas I nasty bug has been found in CodeSnip v4 Release Candidate 1. It also affects Beta 1 and Beta 2.
The bug crashes the UI if more than one snippet has the same display name. That's bad enough but duplicating a snippet that has a different display name to its unique name automatically creates two snippets with the same display name, and BOOM.
So, a fix, CodeSnip v4.0 RC 2 has been rushed out. Please download it from https://sourceforge.net/projects/codesnip/files/Release-4.0.0-rc.2/
In case you've been caught by the bug and CodeSnip is refusing to start, there's a blog post coming soon to tell you how to fix this. Keep checking http://delphidabbler.blogspot.co.uk/
Very sorry and red faced about this one!