Can you point (link?) to the complain?
The problem is, none of the devs (or other users) has reproduced this, so it has to be something very special with your machine....
Now is the big question how do we reproduce this problem on a machine of the devs...
Can you give us windows version (7,8...) Bitnes (32bit, 64 bit)
What exact version of codeblocks are you using? Where did you get it?
Can you open two separate codeblocks instances, by clicking on the codeblocks icon, or on windows 7/8/10 right click on the codeblocks symbol in the taskbar -> codeblocks?