Unable to render mendix widget (re-opened issue)

Launched an ordinary basic form (grid, on click settings = nothing) from a 'show form'-action in a microflow: "Unable to render mendix widget". Definitely no security-issue! Problems started after downloading "Input Reference Selector v1.6" from the App store (could this be a strange coincidence?). Still having no clue. Previous call on this issue on the Mendix forum gave no satisfactory solution. Desperately seeking.
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