ok, this is getting weirder - it took me a while because the dummy survey I set up from scratch using only gif files displayed its pictures as it should do.
Then I made a new dummy, copying my original questions using jpgs and adding 2 more new questions also using jpegs and activated that - and suddenly, a few of the "old" pictures are showing, others are not. the newly uploaded pictures are also showing.
they are now all jpegs, all uploaded the same way.
try this link:
applicantperformance.com/Screening/Surve...n/tk-6sqayw9hmhs5k56