[ovirt-users] cannot change cluster compatibility version from 3.6 to 4.0

[Jiří Sléžka]

Hi all,

I have just upgraded engine from 3.6.6 to 4.0 (all worked fine except 
custom certificate problem which is described and solved here 
https://bugzilla.redhat.com/show_bug.cgi?id=1336838).

Then I upgraded all hosts in cluster and I would like to change cluster 
compatibility level but it fails in a way there is a red border around 
"Compatibility Version" dropdown box but no explanation why. There are 
no entries in logs...

What are prerequisities to change cluster compatibility level to 4.0? Do 
I missing something?

Engine (standalone) and hosts are CentOS 7.2

btw. dashboard looks really nice!

Cheers, Jiri
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