Jetpack and Gridiculous template not compatible?

I’m running the Gridiculous template on my site at https://michaelgaither.com. I had Jetpack installed, but recently, my dashboard disappeared.

If I disable Jetpack – adding a character to the path via an FTP client – the dashboard comes back. Whenever I reenable Jetpack, the same problem happens

Any idea whether this is Jetpack or the theme causing this?

Thanks.