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[ubuntu] Applications Open Multiple instances

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linux-howto

http://ubuntuforums.org – I have a clean install, about a week old, of 12.04 that's until now run fine. I installed a second monitor today and in the process of stumbling through nvidia something odd began to happen: Each time I open an application, it opens three times. Click on Firefox -- three Firefoxes. Click on Rhythmbox -- three Rhythmboxes. Etc. I'm sure I did something stupid, but I have no clue what it might be. Thoughts? - nr (Hardware)