Version: 4.4.2 (using KDE 4.4.1) OS: Linux Installed from: Ubuntu Packages The following steps cause system monitor to crash:- 1) open system monitor and start a new tab 2) add source/line graph to new tab 3) right click and select properties of line graph. 4) while properties window is still open, on main system monitor window add another sensor to the line graph you are showing the properties on. 5) This new sensor will not show in properties and selecting apply or OK in properties window will crash whole system-monitor. Simple solution . . . make properties window modal so user is unable to add a another sensor to graph while it is open.
I could not reproduce the crash using the steps mentioned using trunk. If you are using a newer KDE version, can you still reproduce it? Note that the properties dialogs are probably intentionally not modal, allowing many of them to be opened at the same time.
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The properties window is now modal, so this bug is fixed (regardless if that's actually a good design decision).