I have Kleo running on multiple subdomains. Its more likely to be a plugin conflict or the wrong versions of the the plugins.
If you have other plugins installed, disable all of them except for the ones that come with Kleo (k-elements, VC and Revslider). As of this moment (Kleo is due to update any moment), these are the versions you should have installed
WP 4.1
Kleo 2.3.1
K-elements 2.3
Revslider 4.6.5
VC 4.3.5
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