Do you use any P / Invoke calls? I used to have problems with C interop, where the C dll caused an access violation error inside, which in turn catastrophically damaged the C # application - like your screenshot above. Unfortunately, it turned into a case of searching at the entry point (P / Invoke) in the C dll by trial and error, and then with fixing the C code.
If you are using P / Invoke, are all expected machine dependencies and the correct versions?
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