Same type of issue here, both with version 7.1.1 and with the latest development version mentioned by @shawnogordo.
Any time I try to save settings in Advanced Mode or switch from Advanced Mode to Simple Mode I get a “Page Not Found” error.
I deactivated all plugins and then reactivated PowerPress and still got the same error, so it doesn’t appear to be a plugin conflict.
Does anyone have a solution to this yet?
UPDATE: My web host checked the server log for errors, and they found none.
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This reply was modified 7 years, 1 month ago by leaky.
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This reply was modified 7 years, 1 month ago by leaky.