When attempting to edit existing reports in Strategy Developer 10.4.x, you may receive the following load error.
“Failed to load control ‘msiReportControl’ from M3Report.ocx. Your version of M3Report.ocx may be outdated.”

This is a known issue with Strategy 10.4.x.
Refer to KB307710 to use the cleanup utility tool to uninstall and install the Strategy product.