I updated to 4.1 when it was first released and ran into problems, I have a page of image thumbnails that uses the pagelist_ext shortcode to show a '5 thumbnails per row' grid.
After updating, the layout was messed up, from memory I had 2 rows of 5 thumbnails, then a row of 4 with an empty space where the 5th thumb should be. The thumbnail resizing also seemed to have been affected as some of the images were no longer 'crisp'.
I went back to v4.0 within 30 minutes, I like to keep things uptodate so I'm asking.. what are the exact changes in 4.1 - is it a big modification and why was it necessary?
If I can't use 4.1 I doubt I can use anything after that either, disappointing!
WP 3.4.2, TwentyTen.