Hey walker,
just wanted to let you know about a problem I have encountered a couple of times (GMAT Toolkit on iPad). When I do questions in the OG Tracker and want to filter some question numbers, once the bumber of questions gets bigger (let's say >30) if I do not type in the questions in a very fast manner (slower than 1s) sometimes the app does not recognize the numbers I have entered.
Example: I enter 3,4,6,12,54,75,87,65,99,76,123,125,164,169. By that time the app shows in the upper left corner (0/29) ... and if I make a short pause here the app changes to 0/0. If I click Done in this very moment, it wouldn't allow me to move on with solving the questions, although they still appear in the address line.
It's not significant, just wanted to let you know!
Take care!