In my case disabling Klipper in KDE4 solved my trouble.
See: Bug #311251 in kdebase-workspace (Ubuntu): “Copy & Paste work intermittently with Klipper” https://bugs.launchpad.net/ubuntu/+source/kdebase-workspace/+bug/311251
Note: OpenOffice was the only program I 've used wich caused trouble in combination with Klipper. I don't no where the problem is located (Klipper, OO or different point of views of the use of clipboard in both programs.
In my case disabling Klipper in KDE4 solved my trouble.
See: Bug #311251 in kdebase-workspace (Ubuntu): “Copy & Paste work intermittently with Klipper” /bugs.launchpad .net/ubuntu/ +source/ kdebase- workspace/ +bug/311251
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Note: OpenOffice was the only program I 've used wich caused trouble in combination with Klipper. I don't no where the problem is located (Klipper, OO or different point of views of the use of clipboard in both programs.