My impression of DarkRadiant is quite the opposite... I have found DR to be more than stable and most of the problems I have encountered were not the fault of DarkRadiant, but rather my computer/memory/enviroment. It is important to remember that this is a powerfull editor, better than any Radiant Editor I have ever used, and far more relaible to boot. You have to keep in mind that leaving Darkmod running in a window while using the DarkRadiant editor will slow everything down considerably on a lot of older computers and also increase the chance of errors. Normally If I have a problem manipulating or creating brushes it is because I have been working a while without saving, but rather just building and (dmap)ing a lot without using the filters in Dark Radiant. My current map/FM which is 3+ months into development, with over 7000 brushes, 3000+ patches and 2000+ entities chugs along just fine without any problems. I suspect that Dark Radiant is not to blame if anyone is having that much trouble just starting out.