My IE6 History recently stopped recording new pages visited.
Previous History is still OK going back 38 weeks, and it still makes folders for the current day; but no URLs are recorded there.
I presume the Histry cache-size must've been exceeded, and tried changing registry settings to increase it.
I found three registry entries relating to History cache size, and increased all of them; but it had no effect.
I'm using Windows 98 Second Edition.