Confirmed — AP Reset has never been able to work, for anyone. There are two AP Reset entries in our item table: a working one filed under an internal name, and a do-nothing placeholder filed under the real v83 id 5050000. Everything that hands you the item — the Cash Shop, the GM item command — looks it up by id, and the id only ever finds the placeholder, which is marked as a cash item with no reset effect attached. Using a cash-marked item is refused before any effect can run, which is why nothing happened and the scroll wasn't even consumed. Exactly the same is true of all four SP Reset scrolls (5050001-5050004). The fix is to attach the real effect to the real ids.

Confirmed, and it turns out it's a whole family of reset scrolls, not just AP. There are two copies of AP Reset in our item database: a working one that knows how to hand your ability points back, and a name-only stand-in with no effect that's also mis-filed as a Cash item. Everything that looks the item up by its number — including the Cash Shop you bought it from — was finding the stand-in. The stand-in has no effect to run, and the "is this a usable item?" check rejects Cash-filed items outright, so your double-click hit nothing and didn't even consume the scroll. The four SP Reset scrolls had exactly the same problem.

I've attached the real reset effect to the item numbers themselves rather than swapping which copy the shop hands out, so the AP Reset already sitting in your bag will work now — you don't need to buy another one.

[Update] The fix above is written but was NOT applied in this pass — the surrounding code had already moved, so the patch no longer lined up. Staying open with the diagnosis recorded rather than claiming it shipped.

Fixed, and it turned out to be two problems stacked on top of each other. First, the AP Reset exists twice in our item database — a working copy filed under an internal name and a do-nothing copy filed under the real game number 5050000 — and the shop and GM grants hand out the do-nothing one. Second, even the working copy would have failed: the code that runs an item's effect refused anything sitting in the Cash tab outright, so the double-click hit nothing and gave no message, which is exactly what you saw. Both are fixed. The reset effect is now attached to the real item numbers themselves — AP Reset plus all four SP Resets — so the one already sitting in your bag will work; you do not need to buy a new one. Cash-tab items can now run their effects generally. Items in that tab that genuinely have no effect built yet still do nothing when clicked rather than silently disappearing. One note: I could not open the screenshot attached to this report, so the diagnosis comes from the code and the reference server, not from the image.