Newgens/Regens pictures have stopped showing up. Why?

I've just fired up the game today after playing it yesterday and my regens player pictures have now gone. The generic white pic is just in thier place.

I went into preferences and to see if it was my settings and it was on 'Real Players Only', but when I tried to change it the 'Real & Generated Players' was greyed out so I couldn't select it.

What's the problem? Can I solve it? This is quite a big deal to me as this is on a 10 year long term save and the pictures give my players much needed identity.

Any helpful replies appreciated. Thanks.

Hmmm, now worries now, it seems resetting the game solved it. First time I've ever seen this.