K2 establishes their general guidelines for environment and application software support in their K2 blackpearl 4.6 Compatibility Matrix, under their Microsoft Product Support Plan.
“You have insufficient rights to access the task” Error When Attempting to Open SharePoint-based InfoPath Form
A user is unable to open the InfoPath form associated with a workflow task. The exception reads:
You have insufficient rights to access the task. Ensure that you have contribute rights on the site before attempting to open the task.
It’s a SharePoint permissions problem. Fortunately, it’s an easy fix.
Start Rule 