@nitro: i used "Show unread posts since last visit." button at top left.
@alm: your link is working, i have 9 pages of unread topics now thanks. usually i'll browse page by page. interesting topics i'll open in another tab, when i'm done with a page i'll click "select all" and "mark selected read" then i'll have the next page (minus one page from all). this is where its usually hanged. i reloaded and get empty or only few page. it happened several time already.
fyi: this thread is not updated in my "unread topic" (luckily i manually open this thread again) i wonder why i'll need to check my "ignore section" setting.