I'm just guessing, so this is probably wrong, but it could be something with the graphics, because the only time the game uses transparent textures (like rocket smoke) is when rockets are fired... I dunno. Play around with it and see if it goes away when the smoke does or when the rockets turn off. This really shouldn't be an issue so I really doubt your graphics card is at fault... But somethings glitched, if it IS the rocket smoke...

 This is a recurring issue, and tons of people experience it. It was supposedly fixed in 4.4 or something, but obviously it didn't work. I think he's working on it. Hopefully, he is...

 I AGREE! Yeah, it's kinda annoying to have to reset the key config after every edit.

 This'd be awesome. We could use it for tanks and such... Also, maybe a loose joint... Like for helicopters or other spinny things... I'm mostly commenting because I want this back at the top of the list.

 I think if the counter reaches 20 seconds on that level without you succeeding, it fails you no matter what... It needs to be specified.

 Yeah, I've got this problem too... In 0.4.6a. If it's any help, it seems that when the error occurs and one goes into the settings menu, the buttons aren't shaded like they normally are.

 Thanks for the consideration! Keep up the great work.