Mouse help

Its seems that when you set the cursor (CursorOn) that all mouse input is disregarded Im trying to figure it out but so far my only lead was mouseLock wich turned out not to mater as I thought mouse input only gets sent if mouseLock is true (In the c++ code there was an if checking the condition but then I realized that no brackets ment first line after is only apparent of the if statment, meaning input got send disregarding whether mouselock is true or false).

Suggestions?