[ubuntu] system locks when transmission is in use

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http://ubuntuforums.org – My system goes potty when I start Transmission. first I cannot open files . Then the mouse stops working.The left button stops working and the right button does what the left should do but wont open files then stops all together.:( The only war I can get anything to work correctly is to restart the computer. this happens every time I use transmission. It worked fine untill the last update a few days ago thank you for your help in advance peter (Hardware)