copy-paste text; 3rd mouse button emulation

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http://forums.fedoraforum.org – Up to F18, when I mark text with the mouse it was coppied to the buffer and then pasted when pressing the 2 mouse buttons simultaneously. Now I have installed F18 on my new laptop (Sony Vaio z21 series - 2011 edition) and none of this works. It is annoying because I am so used to this mechanism. Anyone could help solve this issue? Thanks. (HowTos)