Please Help me with starting the game

[mastajp]

Well I recently  decided to redownload the game again after a few years of not playing and I downloaded it on my Apple Laptop and everything was fine until this happened



The top part of the screen flips out and sometimes splits into quarters and will flash and freeze any thing that pops up in it like the menu, and the bottom part just has a blue color and the mega buster, everything else works  

[Messatsu]

Wow, that's......KILL IT WITH FIRE!

The only thing I can think of is to try to change the video renderer and see if it helps.  You can change it either via the startup args or in game.
On startup add +vid_renderer # (Where # is either 0 for software or 1 for OpenGL)
In game pull up the console (PC Default `) and type vid_renderer # with # being the same as above.

I'm not super familiar with the Mac port of ZDR so it's entirely possible that OpenGL doesn't even exist in that version rendering this post moot.  Figured it's worth mentioning though.