If you used new potting soil with fertilizer added, it may be just a little bit of fertilzer burn on the tips of the older leaves. The plant probably also already had some fertilizer in the pot that came from the nursery so it's just getting a double whammy right now. It will ease up and the new leaves will start growing like crazy once it recovers from it's transplanting.
Unless that browning continues, I'd wait a month and see how the plant does.
