Hi Badlydrawnboy,
To troubleshoot the issue, please provide the following information:
1.Regarding "it seems to have something to do with comments, i.e. it sometimes happens after I have created a new comment.", do you mean that after turning on Track Changes, if you click New Comment under
Review, the Track Changes will turn off by itself automatically?
If it is not the situation, please clarify it.
2.Does the issue happen in the specific document or all Word documents?
Please create a new document and check if the issue persists.
3.For the long document you mentioned, where do you store the document?
4.Did you set up any other settings in the document?
5.Detailed Office version. (Word>About Word)
6.Mac version. (Apple icon>About this Mac)
Regards,
Tina