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One specific user gets a severe unhandled-exception error referencing a BadImageFormatException and a missing or corrupted assembly manifest when trying to log into the IEE desktop client, while other users on the same environment log in fine.

Answer

When this kind of client-loading error affects only one user (not everyone), it's usually a corrupted local client cache rather than a server-side issue. Clear that user's local IEE client cache and let the client application redownload fresh from the login URL — this resolves the assembly-loading error in most single-user cases.

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