Building a Barbarian in 3.5e on 6.07.07. Saw this in the Stable build too. As a level 7 barbarian, rage is showing 1 use per day. Barbarian raises rage from 1/day to 2/day at level 4 and to 3/day at level 8.
From SRD: "At 1st level he can use his rage ability once per day. At 4th level and every four levels thereafter, he can use it one additional time per day (to a maximum of six times per day at 20th level)."
Leveling up to 8, he still shows 1/day.
Win10, desktop and laptop both, fully updated.