Just wanted to report this -- it may be nothing, but it popped in my head as I'm going through the QFI-related posts from the last 2 months:
As a Brigand, I couldn't get the Fireflies to go into the Glowing Fungus-filled Jar at the Farm Sign at Night. They are there, but every time I clicked the Fungus-Jar on them, nothing. I could only get them from the Large Stone screen from the Grasslands.
I eventually thought maybe it was a puzzle; Hobbs tells you about both places (farm and grasslands), but only ONE of them works! (The grasslands -- devious!)
So, as I played the Sorcerer and Rogue, I didn't try even bother trying the Farm Sign screen...
When I get a chance, I'll return to my saved games for all three classes and try to get the Fireflies from the Farm Sign for each class.