New Theme Doesn't Work, Why?

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Hi! So after a year of getting my own theme to work, I decided to just buy one from the marketplace. I installed the Ortho theme, but it does not let me publish changes to the home page. Instead, I get notifications that changes are waiting to be published.
Interestingly, all the subpages work.
I attached a screenshot, don't mind that it is in German.
If I want to change the page type of the home page in the dashboard, it says Error without any message.
I really have no idea what the problem could be. Is my old theme messing with the new one? They are is separate folders though.

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JohntheFish replied on at Permalink Best Answer Reply
JohntheFish
For theme support, please contact the developer through the theme's Get Help / Support page

https://www.concrete5.org/marketplace/themes/ortho-theme/support...
monikac replied on at Permalink Reply
Thank you!