Could you, please , elaborate on which version and build number of Windows 10 you are trying to save sessions. You can find this information by running the "winver" command in the search box of Windows.
Please, also provide the full version number (major.minor.build.revision) of Fiddler which you are using. Please, also let us know if there are any error messages popping-up, when Fiddler crashes, and what they say.
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