Threads below have not been updated since your last visit.

[BobMc]

The blue line with "Threads below have not been updated since your last visit." comes and goes. After several days of absence, it has reappeared.

Does anyone know why it's presence is so erratic?

BobMc

 

[clee01l]

If you enter the forum via the "New Posts" section It will show all unread threads. If you leave before readin all of the current new threads, the next time you return you will see the "Threads below have not been updated since your last visit." indicating that those older threads were not read previously.

 

[dhoni4455]

That line usually shows up when the forum thinks there are threads you haven’t seen since your last visit. Its appearance can be erratic because it depends on how the site tracks your read/unread threads—sometimes cookies, session data, or site caching can make it disappear and reappear after a few days.
Basically, it’s normal behavior, just a little inconsistent.