Passolo 2018 installed on Windows 11 crashes on import/export

We've had to reinstall Passolo 2018 on new Windows 11 laptops. The same issue is happening for the whole team:

When we open an existing project and try to import or export an SDLXLIFF, Passolo crashes. This especially happens when we select the "SDLXLIFF" format from the list and click "Settings".

We have an IT tech who says that this DLL is crashing: Sdl.FileTypeSupport.Bilingual.SdlXliff.XmlSerializers.dll

We are using Passolo Collaboration Editiong 2018, v 18.0.178.0. 

We have made sure that all system requirements were installed on each computer (i.e. .Net Frameworks)

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