For example , I found RealPlayer had a problem when the locale set to "en_US.utf8".
Today I launched RealPlayer from menu, I found it was too slow to display the UI.
I think there maybe is a problem .
Then I type realplay in Gnome Terminal and get the following message.
** (process:4421): WARNING **: Unsupported locale en_US.utf8! Please use a locale with .UTF-8 suffix! For example: export LANGUAGE=en_US.UTF-8
But before , the locale settings is correctly.
I do not know which application change the locale setting.