It seems that the "upscrolling the command parameters" disease has reached the Activate Windows command, too.
I entered 'a' as Class, 'b' as Caption, selected 'Match text as pattern' and 'Wait for window to exist' checkboxes, and entered 300 milliseconds to wait. The first time I deselected the command and reselected it again 'a' vanished and 'b' was in the Class editbox with Caption editbox containing the string 'PATTERN' that appeared out of the blue (obviously, it's the text pattern checbox that transformed into string 'PATTERN' :). The two checkboxes were unselected and the 'milliseconds' editbox was empty.
Repeating this two more times resulted in 'PATTERN' 'scrolling upwards' with 'b' blown into oblivion in first step and losing the lone survivor 'PATTERN' in the end. The command contains none of the parameter setting initially entered, it's staring blankly.
Unfortunately the config files reflect the same changes. Currently I'm editing them by hand and gave up on Command editor because it ruins my commands.