Vince Lowi

Hey guys, i got a problem wich drives me crazy. Since 30 minutes i got a bug in my eden editor, wich prevents me from scrolling up & down through the asset lists (left&right side) with the arrow keys I have thousands of objects and scrolling with mouse drives me crazy. If i'm using the arrow keys to scroll down the "play scenario" button gets highlighted instead scrolling down the asset list. Also if I click on an asset, a unit for example on the right it get's instantly bound to my mouse cursor to place it in the level, before that I had to drag&drop the unit wich i prefer. Was this caused by accidentally pressing a key-combo or what can i do to reset it to normal behavior? Please, i need help!