Using ID3DXFont to draw a simple text in the screen when i press the return key "enter" i put this code:
if (ssAlt in Shift) and (Key=VK_RETURN) then
and when i switch the window mode for windowed or fullscreen the renderization disappear...
when i free the font first.... reset the device and recreate the font its works....
but dont have a other way to do it?