No Mechjeb icon on screen

[Tonto]

I have downloaded Mechjeb and am able to attach it to a spaceship, but when I get to the launch or when flying,  even though I can see the Mechjeb device on the spaceship, there is no MJ icon on the screen, meaning I cannot use Mechjeb. Hopefully someone can tell me what I might be doing wrong, or suggest other fixes.

[Cattette]

Windows antivirus and other antivirus softwares can act funny if Mechjeb is installed for some reason, causing this very issue. This could be avoided by simply installing KSP outside the C:\Program Files (x86) directory, Steam has an option to change the directory for where game files gets installed into, but you should be able to just move the KSP folder anywhere and not face any issues with that, just keep in mind that if you decide to move the KSP folder yourself then you cant launch it through the Steam app, you'll have to make a shortcut to the KSP executable and put in on your desktop or taskbar. You wont need to do that if you ask Steam to change the installation folder. 

If this doesn't solve your issue then let us know.