I managed to find a laptop in the house that would run the game. I copied my save file from the mac to this pc. I was then able to continue the game, albeit on a different computer. Arrows would drag and stay in the boxes as expected.
(On a side note, the main menu buttons were invisible on the pc. They were there and clickable, just not visible.)
This thread is probably too old now, but in case anyone has the same issue as I did, and they happen to have another computer, it looks like this is a viable option to get past the problem.
Still love Telltale, and the game! I sympathize with other programmers. Sometimes stuff doesn't work as expected. Making a game is a huge effort. Hats off to the team. Even if there are a few little bugs floating about.
Keep it up guys. I'll be buying more games for sure.