I’ve just released an updated version of the Newsletter Reports extension due to a possible problem when updating the Newsletter plugin. It happens only when the update of Newsletter fails for some reasons and Newsletter ends remaining deactivated.
The Reports Extension, not finding Newsletter installed, wrongly raise a fatal error and the blog can end in a blank page.
If you experiences this problem, just rename the newsletter-reports folder, enter the blog, activate Newsletter. Then go back to the plugins folder and rename back the newsletter-reports folder to the original name.
You should even update the Newsletter Reports to the last 2.0.7 version.