I cannot say much about your problems since the description is quite vague and you're only showing small pieces of code. But whatever you do, you absolutely don't want to call glutMainLoop again after creating the window.
its a very long code....i omitted ones i thought were not necessary.... but if you still want me to put them ...just let me know...........
i still could not find ways of working around the problem...since its imperative for me to create the window only when the button is clicked....the keyboard response has become very slow that i have to wait over 20secs for it to respond......this only happens after the second window has been created an destroyed....on first run(ie when its just the first window running) the keyboard works just fine.
what i want to achieve is to run my program which then creates the first window....then click a run anmation button which has the buttoncallback8 to start the animation.....if i then press esc to close the second window i want to be able to continue using both mouse and key function on window1.....but so far all i can do is create and destroy the second window(the animation also runs when the button is clicked which is fine)...but after destroying the second window i cant use the first effectively as the keyboard response slows down tremendously ...i have to wait over 20sec......i think the problem might be from my approach but i cant find an alternative method that will give the results i want...........i hope my description was better
thanks for your help.