clipboard behavior - text coding

Hi, since some days i recognized that in libreoffice or thunderbird, when i write a text with a "€" (euro-symbol) everiting seems ok. but when i mark the text with shift and arrow-keys then press strg+c and on a other place strg+v the euro symbol is replaced by a "?" (questionmark) if i mark the euro-symbol with mouse and press medium mouse button to copy, the euro-symbol is still there example: writing text: € copiing text: ? i have no idea where to check whats going on here. system is tumbleweed, kde, german i do not think its a tumbleweed bug, because same systems did not behavior like this. it must be a configuration problem. -- www.becherer.de