Regionerating classes that contain custom event accessors that also contain other code blocks causes regionerate to break your code. It moves the events end } bracket to the end of the file.

Here's an example of the code that will cause this:

public event EventHandler MyEvent 
{
	add { lock (null) { } }
	remove { lock (null) { } }
}

public event EventHandler MyEvent2 
{
	add { if (true) { } }
	remove { if (true) { } }
}

I've confirmed this in v0.6.7.8 and v0.7.