It’s actually the under-scroll line that caused the failure. We may consider another naming convention in the future, but for now - as we want to keep the basic game package as slim as possible - we will anyway not include more than 1-2 new resolutions in the near future. 1680x1050 will be one of them, as it seems to be the most popular among the missing ones. But most of the other custom resolutions that will be afterwards created, will probably be included into a separate package with extras (and we’ll see then about a naming convention).
