Well I've quickly retested some of the known issues I track (which Davidfor has not mentioned). And they remain more or less unchanged:
PDF issues:- The performance with some files is abysmal. Link to dedicated thread.
- BUT as also mentioned in that Thread, the crash within 256bit AES protected pdfs has been somehow "fixed". Link to the post in that thread.
- Bad handling of pdfs which contain different page sizes/orientation. It seems the size reference is locked to the first page size, so in the rest of the document you can get cropped pages (in "bigger" pages) or huge white areas (in "smaller" pages). (Link to original thread).
Image rendering in ACCESS (<img> tag handling) is broken as it was in 3.11. (I don't know when this issue started but I'm nearly sure that it worked perfectly fine in older FWs).
Link to post with pictures in the FW 3.11 thread.
WebBrowser continues as "broken" as it was in FW 3.11 The three issues I posted
here seems to be fully unchanged.
And, of course,
all the old traditional known issues remain unchanged.