I've been getting this quite often lately. I'm working on pretty heavy pages and my new classes don't save. The issue appears like this:
I add new elements to some pages, give them existing classes (or not), create new classes to edit style, save my work (until I get the check mark) and then quit the tab. Whenever I go back to my project, everything is there, including the new elements BUT the new classes (ie most of my work) are not there. I get the issue about 50% of the time lately.
Looking for a fi/tips.
Thanks a lot!