Hi there, have you removed the old version of the theme? Remove the old version and install the last update again, 5.5. Then if still happening, go into updates > WordPress and choose the option to re-install WordPress 4.1.1

Also, deactivate all third party plugins to see if there is a conflict causing it, if all goes back to normal with plugins off, go back through and turn on – one by one – to see which one is causing it.