Ok, it turns out there's a resource leak in those issues which was probably trashing memory as well as getting stuck in the endless loop.  I fixed the problem with code on my end, and I made a fix for you guys that doesn't require a code change.  Make a backup folder and move your .tech files and monster.ship into it, then unzip these files to your data folder or your mods\data folder.  This is a temporary fix until we can get the rest of the code in to make techs not dependent on IDs, which is why I advise backing up your old files.  This also has the fixed requirements for LargeScaleBuilding and XenoIntimidation.

http://www.joeuser.com/sdfiles/xtechs.zip