We are sorry about this issue you are experiencing with CAD Touch. The problem is related to an issue with the usage of our dwg database. I'm sorry about this, one temporary workaround is to save (press the cadTouch icon on the top-left part of the screen before important editing operations). Anyway, CAD Touch suffered a period of halt on development, and now finally we are hard at work on a quick bug-fix release and the new 6.0 release with a lot of great features. So please visit our website http://www.cadtouch.com for more news on this. Again, sorry for the inconvenience, and thank you for the detailed description of the issue. Regards, Martin