Describe the bug
The ReactiveCommand canExecute doesn't seem to be working as expected. This code did work at one point.
Steps To Reproduce
Run this project: https://github.com/seanalford/RxUIWhenAnyValue
Expected behavior
Login button should be disabled if Username or Password fields are null or empty.
Screenshots

Environment
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You are inheriting from BindableBase not ReactiveObject
Change your inheritance and everything should work.
BindableBase would work except in this case you're using the Reactive Fody, you'd need to use whatever Prism's INotifyPropertyChanged mechanism.