Another possibility is if Splinetime's PC did the Windows 10 Creators update and that screwed things up or precipitated a user interaction that did so (update started rolling out 11Apr17, ver1703 if I recall correctly).
Not that I have heard of any problems along those lines except that I have heard (on the internet so the claim may be a load of rubbish) that now Edge after that update reads epubs that some claim their epub reading changed to defaulting to Edge.
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