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OK, I have now been through the ticket system, and it seems there is no problem particularly with my system. It is, shall I say, "broken as designed".
To return therefore to what I originally said: I like the new "full-size" photos option, but I have a big problem with it: it MUST be at least usable on ALL screen sizes (see attachment for example of where it becomes broken for users with small screens).
Note that I am not saying it should look as good on a small screen, but I am saying that it cannot and must not be BROKEN on a small screen.
The only solution currently offered is for admins to make the "full-size" photos window as small as the smallest possible window users use (which rather defeats the object of "full-size"), or to accept that it will be broken for users of small windows but that these 'only' constitute around 5% of users - I was shown
http://www.w3counter.com/globalstats.php (this makes me furious!! why should I accept that a function is BROKEN for 5% of my users?!?).
I am proposing that it is either:
a) done as in
http://netto.tijd.be/geld_en_gezin/sparen_en_beleggen/De_10_beste_aandelen_ooit.7900132-1768.art (click on the photos of the richest men under the title "De rijkste mensen ter wereld") and you will see that no matter how small you make the window, the window that pops-up resizes to fit
b) simply opens a new page! (how simple is that!)
I am offered the second solution by Skalfa for a fee. But I believe this is a feature which is "broken as designed" and a solution should be made to work for ALL sites.
What do you think other admins?