There is no way, currently, to make versions of ADA/MTP with such a disparity work together.
The only way to fix this is to roll back to version of the ADA console or to upgrade the Multi-Port monitors to a compatible version.
To roll back ADA:
1) A viable backup of the ADA database must be available. This backup must have been taken prior to the upgrade date.
2) Uninstall ADA and reinstall the version of ADA that was present prior to the upgrade (ans was also functioning)
3) Replace the MYSQL database folders within the ADA installation structure. The 'super' database files are located at <install directory>/CA/mySQL/data/super
To upgrade the MTP:
1) Refer to the documentation located at docops.ca.com to properly upgrade the Multi-Port Monitors to 10.5+