I also started to experience problems sometime early last week. Tags are what I'm having issues with. I can highlight/underline, add notes/annotations - but Tags are not functioning. I can create a new tag, but I can no longer apply an existing tag in a note/annotation. As I noted, this has been going on for days now.
I stopped using the online tools for almost two years because there were so many issues with it - and it also blew up my notebooks - twice - so I threw my hands up in the air and said forget it. I have recently come back to it because I have run out of room in my scripture margins and don't want to go buy another set of scriptures again. So, I have only been using tags as I think those are sufficient for my needs - but now not even those are working! I have begun to believe that these tools are not widely used by the membership of the church and as a result, the importance given to the functionality of annotations, tags, etc. just are not important to the corporate church. This is demonstrable in the number of failures of the system and the response time in correcting them. It certainly isn't a lack of resources, but a lack of how these tools rank in importance, and focusing those resources to keep these tools up and functioning properly. Very unfortunate.