Ah, Very Sorry about that, I was hoping no one was using or was too attached to Re-Worked M-Spec 4 and M-Delta Themes, I decided to discontinue these during the latest update as I couldn't get the effect right on the new buttons and couldn't remember how I got that effect to begin with. This won't be happening with any others though as they are easy to match and for any others that may be tricky in the future I'll be keeping a blank button image so I can resize and paste the icon on top if necessary as I have with M-New Gen, lucky I had the foresight to keep a blank button for that when I made it or it would probably have had to go as well!
The other M-Spec themes should have blue buttons as they always have but the shade is much closer to green than the Re-Worked version was so may look green to some, our perceptions of blue and green may be different lol. We have a plate at home, my wife says it's yellow, I say it's orange. 😆