I just upgraded to 1.6.1 and when I went to continue to read the book I was reading 'The Difficult Doctrine of the Love of God' I saw (with iPad in portrait mode) it now had two columns?!? What gives? Also happened with other books.
On checking Settings I saw the new 'Max Columns' option, it was set to 'Auto'. It seemed strange to me that a book would be set to two columns — that only allowed 5-7 words per column and was uncomfortable reading.
The only way to get it back was to force columns to 1, but then when I change the iPad to horizontal it stays as one (very wide) column. If I put it back to Auto and change to horizontal the book goes to 3 columns!!
I'm not sure what was the intentional and rationale of the max columns — auto — setting but it seems not logical to make a book in portrait mode be in two columns. I don't even read my Bibles on the iPad in two columns — no sense to me. But if I had the iPad in horizontal mode I (and most people I think) would like two columns.
Can this please be reconsidered as this seems a backward step, certainly out of step with every other ebook reader software. If the auto setting is going to stay it should be 1 column vertical, 2 horizontal.