I’m using OS X 10.6.8, now with Firefox 24.0 (same before with 23.01). After placing the first element (a battery) into the schematics and right click to end the element the cursor sticks to the canvas in all zoom-levels 100% and higher. In 50% it’s not, but I can’t end a line or element with right click (menu pops up, all dimmed). I have to use “esc” but this will delete any wire … Back to other zoom-levels the cursor will stick immediately.