Gordon, this is mysterious. Yesterday I tried a couple of different files (jqz, jmt, etc.), with different source files, and none of them worked, all returned the same error message, while they all worked in 1.9. I wanted to test them once again this morning before attaching them - and they all work fine now. I swear I didn't change anything. And I didn't make up that error message, that's what I got every time I tried. What is going on here?
I think my initial assumption was right and I must have missed something simple and obvious, and then I must have changed something without noticing it, which doesn't reflect very well on my abilities.
I'm sorry about the false alarm, Gordon.