One more thing, sorry for double post but I think it is needed. I had a problem with DC crashing and corrupting game.dat (data folder of ToM design). Lucky that I have backup version that I have uploaded on site else I would lost all my work probably. It happened while I played DC and also DC Editor was started and in memory. I tried closing it, probably while saving or something like that but it has been frozen for a moment and I think I have closed it from Windows Task Manager. Then after I couldn't start my design at all in editor, it reported that it game.dat file is bad, I tried to copy it from my 640 version of ToM but it said that it has some problem with Starting level and it all didn't looked good. Then I went for online backup and made things work again.
This is not first time it happened to me, but before it usualy states that config.txt is missing. Now I made a backup copy of all of my works and will be more careful with backuping.
Also one more thing that happened before is that when I use DC Editor with usb flash disk and unplug disk from lap top when I return it DC Editor used to crash, but now it works good and I can actualy remove usb flash disk and return it and continue to work in editor. I guess that is good improvement though I am not sure how it happened