Magnolia 6.2.11 known issues
Preview as visitor works only with en as default JVM language
In Magnolia 6.2.11, preview as visitor does not work when English as the default JVM language specifies a variant (for example, en_US as opposed to just en).
For languages other than English, the issue occurs regardless of whether any variants are defined (for example, with both es and es_ES).
For more details and a workaround, see MGNLPN-564.
| To fix the issue permanently on your instances, update the Personalization module to version 2.0.10 or later. |