My Win 10 caclulator has just started misbehaving - not sure if it has been updated or something odd is happening to my PC.

In scientific mode, if I click 10^x on the result of some other operations it gives 'Invalid input'.

Eg: Enter 100, click log gives 2 as expected. Now clicking 10^x gives 'Invaild input'. Same if it follows a sqrt(), sin(), ln(), e^x etc but ok after 1/x and entering a number.

Is this just my computer?