[tex-live] problem after upgrading. on Windows 10.

[Akira Kakuto]

Dear Pi,

> Reinstalled everything and still the same problem. 
> The problem only happens with the 64bit executable,  the 32bit one is OK.
>
> Now, after   fmtutil -sys --all   it works, thanks.
> I don't know if this happened to others too

Please read  "00README.TLW64"  carefully if you want to use 64bit binaries:

    The 64bit binaries are made with the latest sources. Therefore several
    TeX engines may not be compatible with the present TeX Live. Thus users
    should run the command
    fmtutil-sys --all

Best,
Akira