Although we do our utmost best to upkeep the quality of Floorplanner somehow we introduced a nasty bug during an update we did last Thursday. It made Floorplanner less usable in Internet Explorer (Firefox + Safari were unaffected) as the drawing of walls and rooms was slower and less responsive as it should be. The same bug also was the cause of some other issues that seemed unrelated like a black background that suddenly appeared when plans were printed and a few other strange issues that you have been reporting. Based on your feedback Gert-Jan was able to find the bug and solve it quickly and we did an update yesterday that seems to have fixed it. Thank you all for your feedback and sorry for the inconvenience it might have caused you.