Hi Pratik,
Well, I went into the database and changed the theme option to twentythirteen. That got me back into the admin stuff. I started looking at the live previews and none of my themes showed a live preview. I tried to find some new themes, but I was unable to connect with WordPress. There was some kind of error connecting. So, I walked away for a bit. No idea why, but this am I was able to load a bunch of themes, including Catch Adaptive. I still cannot use the Customize tool, but at least I can see my WP Admin pages.
I have no idea what happened. I guess the issue resolved itself. Some kind of temporary wackiness. Must have been a caching issue somewhere…