Installing the
February 9, 2021-KB4601050 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2 from Microsoft
Breaks MET/CAL Editor version 10.2.<builds> when docking windows/forms.
There is a resolution to this by installing a small registry edit.
You will need to install EITHER the 32 bit or the 64 bit registry edit depending on your Operating System.
You will need administrative rights on your computer to be able to apply these registry edits.