Possibly maple scale. I remove them manually but my maples aren't that big. There is probably some spray you can use if you believe in better living through chemistry. Some type of scale seems to occur in limited amount on my maples yearly - but they seem to do limited damage (I do give some of them the shaft)

Thanks to everyone who took the time to help me! I ended up getting everything stabilized and they are mostly back to normal. I had a few things which all contributed to the edema issue and then a period of over watering after transplant. As I said, the big closet they are in gets pretty warm and humid due to the door being shut to keep the cats out. I had a fan on them and with the furnace running, it was keeping the room cooler and keeping the humidity down. After transplant, I did a heavy watering. For the next 5 days, I didn't run the fan and it has been warming here, so the furnace hasn't been circulating the air to keep the room cool and to remove the humidity. I think this caused the edema and the lack of water evaporation which caused the wilted leaves from the wet potting soil. After I figured this all out, they all stabilized and are looking much better. With the nicer weather, time for them to start transitioning outside. Still 4 weeks to go. Next year, I will be waiting 4 more weeks to start the seeds. They are getting too big, but I had spring fever. :)

I would not be concerned, leaves look pretty healthy to me...

Do you have any more pics? I suspect the neem oil fried the leaves and they shriveled or dropped or maybe some herbicide drifted onto them? Excess fertilizer can also burn them. It's just hard for me to see. I'd also suggest some critter may be eating them, but seeing as how you have buds that probably isn't the case.