Today I was doing a demo of the CKM on one of my openEHR courses and some mindmaps were not working, for instance the blood pressure one, there was just a blank screen with no nodes in it.
Ping @sebastian.garde 
Hi @pablo,
Yes, I am aware of the issue.
I assume you are using Firefox if you get a completely blank screen, in Chromium browsers you see more.
The DV_TEXT/DV_CODED_TEXT choice in combination with some additions for WCAG level AA compliance is the problem in that mindmap.
We will provide a bug fix release for this and one or two other little issues very soon.
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Yes, Iām using Firefox.
Minmaps for other archetypes work well.