Good - I'll check again with the next beta.
It was just a surprise that it failed, because I've been using that image (along with others) in test albums for years, without any problems.
I think it's a side effect of Java 9 having a somewhat more capable image reader, meaning that some thumbnail reading that was totally ignored by Java 8 is now attempted by Java 9, but caused this failure. I solved the problem by catching a wider range of possible failures and resorting to a fallback.
Edited by: davidekholm on 14-Nov-2017 13:27
(changed "not" to "now")