So recently, I've been using the duplicate tool, and It's worked fine till now.

I make a vector drawing on a new sprite, and when I duplicate that sprite, It's in the sprite list, but not on scene. I've used ‘go to X Y’ commands to try and move it, and I've tried to drag other sprites, but it glitches up and shows me an older sprite I deleted long ago instead. To fix it, I just save, leave, and come back to my project, and it works normally, untill you repeat above. I'm running FireFox on Win. 7. Yes, my internet is working fine. The game is ‘Wall Destroyer’ by me of course. If you look inside, the black background is merely a shade-er, not a background error.

when I receive [an invitation v]
ask [Where to?] and wait
if <(answer) = [The worst house eva]> then
say [I not going >:(]
    
end
if <(answer) = [Pizza Hut w/ video games]> then
Sing for joy
    
end