which leads to #basicNew: primitive fail, because it passing a negative number (no surprise, it fails). According to stack trace, a Text>> copyFrom:to: is called with arguments: start = 100 stop = 44 (instead of having start = 44 , stop = 100) it is called from MultiNewParagraph>>buildSelectionBlocksFrom:to: method. I don't know whether we should fix this method, or maybe it is better to fix #copyFrom:to: to accept inverted ranges (a simple check if stop < start then swap the end points) yet it hard to reproduce, it works ok most of the times :( To reproduce the bug, try to do following: - open a new workspace window, type an arbitrary text there - then drag a window to the bottom of desktop, so only title bar of workspace remain visible - release drag - click on the title bar and start dragging it back to make text visible -- Best regards, Igor Stasenko AKA sig.