I used the other picture based plant diagnosis faq, the one from drugs-something.com that gets posted a lot around here, and it matches the diagnosis that I see in the post you mentioned too, that looks like a calcium deficiency.

Browning tips, with little brown spots appearing in the leaves later in development. I've had browning tips a bit for a while and assumed it was because I used a soil with some nutes in it, but now I'm thinking the level of nutrients was quite low, as the plants seem to have perked up after their first feeding with big bloom and grow big this morning.

I don't expect the quality of the lower leaves that look affected to change, but hopefully it won't continue up the plant...

We'll see.