Joikuspot was working fine with titans kernel but stopped working after installing mobilehotspot ? That would be interesting but I cannot see how the hotspot would mess joikuspot up in any permanent way. The frontend does nothing but set some configuration variables and run the backend script, the backend does insert some kernel modules on start and might not be able to remove all of them on stop (due to interesting interdependencies), said modules might interfere with Joiku (but in that case Joiku has serious issues to begin with) but reboot will always solve that.

Edit: If you want to get rid of titans kernel run "apt-get install --reinstall kernel kernel-flasher && reboot" as root (this will reinstall and flash stock kernel).