Unable to search, or display issues in JIRA, or JIRA Agile.

When performing any issue lookup function within JIRA, or JIRA Agile, the user is presented with either a 500 error, or a page only displaying JIRA's header and footer without any information returned.

JIRA components/actions affected:
Saved Filters
Issue Searches
Accessing Behave Pro Plugin modules
Accessing My Work Calendar Plugin Modules
opening single JIRA issues
trying to view Agile Boards

Workaround:
1. Disable Atlassian Connect plugins such as Behave Pro, or My Work Calendar, or Zendesk.

2. f the issue persists, please contact support immediately @ support.atlassian.com