I'm not sure. I did mine on the 19th and got £3.30 for it if that helps.Was this the 'how does your sentence end' study or a completely different one? I just tried to do it and got an 'your connection is not secure' firefox warning, so did not proceed any further, naturally.
Then a couple of minutes ago, Prolific said they were having some issues but refreshing it, and got back to the normal screen okay. Anyone else having any problems? thanks