From reviewing your threads, the issue is not that Polylang does not work, but whether it is compatible with every plugin out there, more specifically the “Theme My Login” plugin which you are having troubles with.
Maybe the author is taking a break and is not ignoring you intentionally, and thats why there is a community here, maybe someone will help, maybe not. My advice to you is to choose between:
(a) disabling Polylang until this problem is resolved,
(b) disabling the “Theme My Login” plugin instead.
It all depends on which of your needs are more critical at this stage. Polylang’s functionality, or your theme’s styling along with it’s functionality. ??
Sorry I can not be of more help to you. Good luck!