It is related to the time offset. No matter what time offset one enters, when in old timers threaded view the list of posts doesn't reflect the offset, only the post one is reading is affected by the offset. It does the same thing at ubbcentral forums too.
When i started the thread i linked to above i hadn't realized you had already reported on the problem. You also did, on my thread, confirm my experiences. I thank you for that.