Ever since upgrading to WP 3.5, .gifs are no longer being re-sized correctly to thumbnails on the homepage, categories pages, and archive pages of my site (everything worked before upgrading). .JPGs and PNGs are fine, though.
I have these settings under Settings>Media:
Crop thumbnails to exact dimensions checked
Organize into month and year folders.
I am using the same exact theme and settings that I was using before upgrading.
I have tried deactivating all plugins and there seems to be none that are conflicting. I have tried the Regenerate Thumbnails plugin numerous times over the past two days and that hasn't helped either. I have tried uploading the same image (as .gifs) using the Featured Image option within posts, but that doesn't work. However, if I upload the image again as a .JPG or .PNG, then it re-sizes correctly.
Examples can be found on the homepage here: http://sensiblyfit.com/ (scroll down as the very last post is one that will not re-size to 150x150 and I have no idea where the thumbnail dimensions for this image are even coming from?).
And here: http://sensiblyfit.com/category/recipes/
The one and only instance I can find where a featured image (that's a .gif) is actually resizing to 150x150 on an archive page is here (the very top image): http://sensiblyfit.com/2012/03/ That photo is used as an image within the post as well and the original is 300x300.
Thank you in advance!