Hi Diane, I've never encountered anything like it previously, only when playing between RGB and CMYK spectrum conversions.
However, it sounds closely related to your colour management policies, which may have defaulted with an update.
Basically (sorry I'm using a Mac, location might differ), when you go to the edit bar at the top of the screen, there is the option 'color settings', inside here there are a bunch of options which will effect your file when it is opened.
This can be located in your entire Adobe suite as far as I know. Therefore, I would suggest making a note of your illustrator settings, and use them for both ID and PS. It is worth noting that there is the option to convert to a different profile, just below this aforementioned color settings bit too, changing this to the same as your illustrator file is another possible solution.
I hope this helps you get to the route of your problem, let us know how you get on.
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