Every time I upgrade I get new problems. This time things won’t full load, sometimes I get odd fonts until I refresh again, and it’s constantly crashing.
I tolerate the problems because of the addons, though.
I was having similar problems, especially with fonts on the built-in text editor. My son turned off (in the options-advanced tab under "browsing") "use hardware acceleration when available". The thing works fine now.
It might be something worth trying.