I didn't get paid when the last Ethereum block was found!

When did you stop mining if I may ask? It's possible your shares fell out of the last-N shares as the effort was way over 100%.

A few days ago.

My bad, the effort is not over 100%, misread the poolstats. I am not able to provide an answer unfortunately. We'll have to check with the pool operator.

Just to clarify, can you be more specific as to what days you have mined?

I have no other explanation for this other than you've stopped mining so long before the block was found that none of your shares fit into the PPLNS Window or you've mined using a different address.