Transparent Leaves on Syngonium?
My fiancee has an Arrowhead Plant that is about a year old. It's still pretty small but it seemed like it was starting to take off recently. Yesterday, I was over at her place and noticed that the leaves now have transparent spots on them. Some parts of the leaves have retained the normal color but most of the leaves are transparent.
Does anyone have a clue what has caused this? I have tried googling it but all I've found is someone else's thread on another board (with no replies!). I also found posts about "bacterial leaf spot" and I'm wondering if that's the culprit. I have a picture below but I don't think it really shows the transparency. Any help is appreciated!