Edited chapter 17/27, adding 100 words, coming to page 62/91. (Yes, I've managed to add half a page without realising it... MS Word for some reason no longer tells me how many pages there are in the bottom-left corner, which might be because of Windows 8, so yeah, I've been up to page 91 for probably a few days.)
It was only a short chapter, and there was something I needed to change, which had so far survived since the first draft. Namely, a minor plot hole...
My characters had scried out for locations of magic in the city, and then visited all the towers to mark out what was where. That bit was all fine, except that I realised that when they marked down which towers had the magic stuff happening, the tower they eventually wind up at didn't have magic happening in it yet... Whoops. And it's established in chapter 1 that this tower was unaffected to begin with.
So yeah, I had to fix that a bit... Wasn't too difficult, really.
As far as I know, though, that's the last of the plot issues with the book. Hooray!