Packages randomly not installing

Hey, I'm running into odd problems with InstaUp2Date... Specifically, each time I build my image it seems to be missing different packages... When I look in the simple log files it indiates they are being installed, when I look at the more detailed one, it *sometimes* says "installer: The install failed (The Installer encountered an unknown error that failed the install. Contact the software manufacturer for assistance" More often than the fail message though, I get indication that the package installed. But it isn't on the final DMG. Anyone else seeing this? In trying to troubleshoot this, I renamed my HD (was named Macintosh HD, which was also the final DMG name, so wanted to make sure I didn't have a conflict). I'd double check my installers, but honestly it's different installers each time - so I'll do one build and iMovie 06 for example will work fine, the next build it doesn't. Also, my final DMGs all seem to be coming in around 9.53GB - is there some kind of limit on final size?