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Part of a stream is now underground so I'm trying to use split features to break the stream into two pieces. The manual says to select the feature, then the split features icon, then draw a line across the stream where I want the break. All it does is keep drawing red lines, with vertices wherever I left click, green vertices where I right click, until I crash qgis. (Yes I toggled edit)

What should-be-obvious thing am I missing?

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up vote 3 down vote accepted

To use the split tool, you want to left click at least twice to create the line that will split your existing line, then after the 2nd left click you right click to finish the process.

I was kind of able to duplicate the behavior you're seeing when I left clicked to start the split line, then right clicked at it's end point. The green X would appear, and not go away until I performed a valid split. I'm using 1.8 on Windows 7.

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Works, with one addition: the right click has to be close to the 2nd left click (on my Mac, at least), then a green X appears where the 2nd click was and the line is split. However, selecting a point to be removed, then hitting delete as in the manual doesn't work! I tried undoing edit, saving, then re-enabling edit - still no luck. Also no luck with any of the other delete x options. Another should-be-obvious goof? –  johnsankey Mar 12 '13 at 22:51
    
@johnsankey please accept the answer if your problem is solved. –  underdark Mar 13 '13 at 7:22
    
It isn't solved! Not only can I not delete the points at the ends of the two segments to create the gap I need, the split line feature has gone back to its prior behaviour so I can't cut the line in two places then delete feature. I can't select both sides of the previously split line to merge them either - it only selects one at a time. I don't know what is going on with QGIS in the Mac world... –  johnsankey Mar 13 '13 at 12:32
    
I think that if I hold the right button down for at least a second that it improves the odds that QGIS will accept the split, but it's still a 50/50 question. And, the only way I've found to get out of the situation is to crash QGIS (command/Q) - when it's drawing those red lines everything else seems dead. –  johnsankey Mar 13 '13 at 14:45
    
One thing that helped me was to do the two left clicks to create the points, then move the mouse off that last point before right clicking. I wish I had a Mac to test it on, but this method works for me on Windows and Linux. –  HeyOverThere Mar 13 '13 at 16:43
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