My TV is 1080p, and I run my mac at 720p just so I can see what I'm doing. The problem is in the resolution it runs at not whether it's 8-bit or 16-bit 32-bit 64-bit or a million-bit. It's operating resolution. Now Zquest runs at 800x600 and ZC runs at 640x480 and don't tell me you can't change that because I've done that myself in the past. I can tell you you that you haven't done enough for mac users. Download this and set your screens to 1280x720 and see what can be done.
Keep in mind I had to transfer these files to my old Windows 7 PC so I could edit them.
http://www.speedyshare.com/aba5j/zc-2-50-1-mac-721.zip