Nope.
its definitely broken.
here is the vid
and
here is the description Ive added on the youtube vid
Selecting multiple styles in Pinegrow Active Tab to show and hide styles
breaks functionality and permanently comments them out, thereby removing them from the Active Styles tab completely and making it impossible to re enable them by clicking on the EYE icon as - it is no longer present, since the entire styleset or individual style has now gone from the Interface for good.
Restarting Pinegrow does not fix this.
Only manually editing the CSS stylesheet and removing the comments, re enables the styles/stylesets to once more become visible in the Pinegrow Active styles tab panel… for elements, for which it is active on in that state of course! 
I can now finish my baked potato, knowing Ive not gone (any) mad(der) and then head to the horses.
N.B.
This is BEFORE uninstalling and reinstalling PG again i should add. I will do that testing later
UPDATE
ok uninstalled, reinstalled,
Went straight to the project, did the same thing, more or less, with a little more order
and have worked out that it is , in THIS example , when you Hide then RE ENABLE>… the
main root style of the pseudo classes that everything falls apart. (rather gracefully no crashes, just everything works as before but with your comments now totally invisible, so welcome to the land of confusion!)
here is youtube commentary , followed by video
as can be seen in video,
multiple active styles of an element which has various pseudo classes can be shown and hidden.
Pinegrow accomplishes this by commenting OUT those styles in the accompanying style sheet.
however, when using MULTIPLE show and hides… and alternating between them OR using
Pseudo state styles
AND THEN HIDING THE MAIN ROOT STYLE of those states… on re enabling that main style, all the pseudo/sub styles REMAIN commented out in the code and make it impossible to carry out out further modifications/show hide in the visual editor as those styles have now remained commented out and cease to be accessible via the visual editor’s active styles tab.
