It's possible that your security or malware program is recognizing the game as a threat, so it may have auto-blocked Feral Heart. Be sure that any programs (try your firewall, too) are not blocking your access into the game. If this problem continues, try running the game as an administrator (right-click on the game icon, and select "Run as administrator.") If this still does not work, try to go into your Feral-heart files and change your rendering system. To do this, go to your computer files>>(C:)>>FeralHeart>>ogre.cfg. From there, you can open the ogre file through Notepad, and manually edit the rendering system. If the system is set to OpenGL, change it to Direct3D9, visc versa, depending on which your system is already set to.
If it looks like this...
Render System=OpenGL Rendering Subsystem
[OpenGL Rendering Subsystem]
Change it to this...
Render System=Direct3D9 Rendering Subsystem
[Direct3D9 Rendering Subsystem]
