That's what I think too. The brown leaf can't turn green again, plant would look better if you take that off, but glad you left it on for the pic to show what's going on. Looks like it has a toxic buildup of something in the soil, likely fluoride, to which this plant is very sensitive. Over time, some tap water can alter the PH of the soil also. Has it ever been repotted? The next time it's dry, I would flush the soil with a gallon of distilled (not bottled drinking water) or rain water if possible. Pour about 1/4 of the gallon on it, wait 15 minutes, pour another quart. Wait 15 minutes, then very slowly pour the last half gallon, all over the surface of the soil, not just in one spot. Then let it dry well before watering again. It likes very bright shade, but not much if any direct sun outside. In the house, some direct sun that's not during the middle of the day should be fine. Come on by the house plant forum if you have further questions or need instructions on repotting, best done during summer.

Thanks to everyone who tried to help solve the AV mystery! Actually, Fred, it's my poor photography that makes it look like it's the wrong size pot for my AV... and while it may be a taller pot than required, it's got a nice reservoir at the bottom and a slot for bottom watering, which works out perfectly. If you could see the plant in person, you'd realize that the plant is not sitting center in the pot, thus making the shot I took seem like the plant is swimming in that pot! Thanks, though... every little bit of info helps. :-) The flowers on my AV are not a pink, but rather a violet with darker purple edges and tiny spot-like things on the petals. Exactly like the one Elaine posted, but more purple than pink. It's quite pretty, really. The leaves are a medium green. There are a couple of older leaves toward the bottom that are a bit yellowed, from age, I presume. I should cut them off. This is the first AV I've had that has actually bloomed for me beyond the blooms that it came from the store with! I've had a few others, but they never repeated the flowers that they came with. I'd get them home, and they'd drop every flower and bud, and just be green. Green's not bad, but I think they're known more for their beautiful blooms! Not sure what I'm doing different this time, but whatever it is, it's working. I keep it in an east window next to my amaryllis collection, feed it with dilute fish emulsion fertilizer, and water it from the bottom. I keep it rather moist, or I should say, I fill the pot's reservoir when it empties. I also remove the spent blooms and any leaves that die. I do have a question for all you AV Experts... when the central stem becomes leggy and tall, what do you do? I never have any luck starting new babies from leaves, so that's not an option to obtain a new plant. I'd like to keep the original plant, but I don't know how to cure it's too tall stem. How do you guys handle them when they get leggy?

Ok... so I followed the link gg posted and this is what I found... I guess Monica isn't the only one to head to the woods with that yuck! "During the spring and summer of 2003 and early summer 2004, numerous sightings were reported. The slime mold is usually found growing in mulched areas near homes and office buildings, but can appear in forested areas as well."

See, thats the "bizarre" part of this. We just purchased this house 2 months ago. The previous owners lived here for about 18 years. Our neighbor planted this in OUR yard (of course it wasn't our yard 15 years ago). Who the heck knows why? I can't even imagine taking one of our indoor potted invasive plants & popping over next door to plant it-lol! The thing is, he's proud of how well it has grown? We'll be putting a fence up in another couple of weeks. So, he'll have to hop the fence to plant the poison oak he's got clippings of:-) May I ask you a question about where to put it? Our house is on a crawl space. I was thinking of putting a clump of it in a shady spot right up against the house & the deck. I'll keep it in check by chopping the rhizomes, as you mentioned. However, if they go under the house (into the crawl) or under the deck, will that be a problem? There is absolutely no light under the crawl & almost completely dark under the deck. Will the plant naturally "not" grow in those areas? I don't want to create a bigger problem. I'm also going to offer the rest up on freecycle or the va board here at gardenweb (free for the digging). Do you think people would want this? Any transplant issues I should know about? Thanks so much.