I was thinking this might go unnoticed in the other thread. Here's a fix for being stuck on the mobile version of the forum.
First of all, we need to find your "form hash". You can do this by right clicking on the page, selecting "view source code" and then searching for a string with "k=" in it. You can do this very easily in Chrome by hitting CTRL+F to open up the search box while viewing the source code. After finding "k=", you should see a long string of numbers and letters trailing it looking something like this: 4cdeb605bd4e37d562b00cdf20c004cc
After you've found your form hash, we need to create a link that's going to reset the skin back to its old appearance. Put your form hash at the end of the following link:
Copy and paste the entire link which now includes your form hash into your browser window and hit enter. If you did it right, you should now be using the default theme.
For comparison, the full link should look something like this: