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I have an error on startup that's been happening a couple of versions. The option to discard, report, save, etc shows up, and I'm able to discard and play. A gauntlet save is mentioned, but I haven't had a gauntlet save in a long time.

First, try to use one of the daily snapshot of 1.6.54 :
https://downloads.cardforge.org/dailysnapshots/

1.6.53 is nearly 6 months old and there have been a lot of bugs fixed and more sets and cards supported since 1.6.53, so there is some possibility the crash you're running into has been fixed already in a 1.6.54 snapshot.

Now if by any chances, your crash is still happening in 1.6.54 snasphot, try to clean up your saved decks and etc.. (see if you can find the "gauntlet save" in there) , by default their location on window 10 :
C:/Users/<your username>/AppData/Roaming/Forge/

Thank you for the quick reply! Switching to the snapshot worked.

Now, I just need to hope whatever fixed the bug makes the full release.

On a side note, the Gauntlet folder had been empty since the error starting occurring: somewhere in the 1.6.2x-1.6.3x versions. I just got used to clicking discard whenever I started Forge up.