Posts marked "read" that I have not read.

[Make7]

2. There is a setting to highlight the 10 newest replies and "mark" the rest as read...

... which is found to the right hand side under OP's and over the list/links to replies. The actual text reads as follows:

  Always highlight: 10 newest replies | Replies posted after I mark a forum


Sometimes search results (e.g. from Google) will include that setting in the web address and clicking them will change your settings without you realizing it. If you are viewing the mobile version of DU, the links to change the 'mark as read' preference are hidden - here is the web address to switch that setting back and forth:

https://www.democraticunderground.com/?com=thread&address=125612821&togglemark=1#toc

(You'll have to copy and paste that - I didn't want to make an active link where people might change their settings without wanting to. Every time that web address loads the setting should toggle between '10 newest' and 'after marking forum'.)