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I've looked briefly into it, and was able to reproduce all the different blank screens, but I don't know the cause.
I would need access to the DB and the FTP. You can email me and if I find the time, I'll try to look into it.
The textsanitizer error might be related to some conflicts with UTF-8, but again, I couldn't find anything on the surface. You might look at the files and their encoding, and the DB, and its encoding.