(http://img97.imageshack.us/img97/8563/blahblah5ge.png)
Everytime I inport a background that popups.
Its a new room!!!!
This happens, as by default, when you create a new room, the background is set to 320x200 total black, so when you import a background which's not 320x200 it will remind you of that.
To remedy this, there's actually a not-so-well-documented feature, use the _blank.crm room file.
Just start a game, go to room screen and import a black bg with size of your choice (it need not be black, it's up to you), and then save it as _blank.crm in the game's folder, that way, whenever you choosed "new room", it will load _blank.crm and let you work with it as template.
Thank you Gilbot, that did the trick. good to know these little tricks and you don't know of them unless you ask.