Sorry for any inconvenience the original upgrade caused!
We did hear that some users were having issues with the initial release of 2.2.9. Rest assured, we have since released an updated version to account for this type of situation (version 2.2.9-101). If you follow the steps in the following article, you can upgrade to the latest version and use MM without password hiccups.
is there an option to simply not require 8 characters?