There are no crossed linedefs in Frigid Peak. Doombuilder is erroneously detecting the very closely packed linedefs I use for the deep snow as crossing each other. If you open Mystic Realm and look at Midnight Freeze, you'll find that the same thing happens. If that many linedefs were truly being crossed, I doubt the nodebuilder would succeed in processing Frigid Peak's maps.
Most of the rest of your reports have a similar cause, in that they're related to the use of fake floors for the aforementioned deep snow effect. This is a very recent change (recent in terms of version numbering, I actually did it a couple months ago) so there are going to be glitches. Assuming I can find them, they'll be fixed. It would seriously help if you people could take the time to describe where you're finding these glitches, though. I have a lot of maps to keep track of, and as a result I don't know each area down to the last detail.
Most of the rest of your reports have a similar cause, in that they're related to the use of fake floors for the aforementioned deep snow effect. This is a very recent change (recent in terms of version numbering, I actually did it a couple months ago) so there are going to be glitches. Assuming I can find them, they'll be fixed. It would seriously help if you people could take the time to describe where you're finding these glitches, though. I have a lot of maps to keep track of, and as a result I don't know each area down to the last detail.