We are using JIRA v6.3.13 with ScriptRunner v3.0.7 and since a few weeks we have been receiving the error "Field 'issueFunction' does not exist or you do not have permission to view it.". This happens for all users we have tested. We have filters and dashboards using ScriptRunner scripts, and this has been working for months.
I already tried to disable and enable the AddOn and to re-index the system.