TresGuy, I'm reading your changelog and seeing that apparently opening the menu crashes the game now? That's one I've never heard of. This level isn't detailed enough to really seem like it should be unstable already, especially considering the previous Tres20 level and how detailed it became.
I have looked around the level in TresEd as well as run it through GeomAdd trying to work out potential causes for any instability (should also check with GUIApp). The main thing I'm noticing which could likely cause crashes is that there is a lot of unoptimized terrain in these areas:
- Stream leading from bronto skull waterfall
- Valley from town entrance train station -> beach near Aviary road
- Town plateaus (and base of Town valley)
- Area around the incomplete mine
- Entrance/exit to underground bunker
- Minor: the new mountain behind the town could also use a bit of optimization
I highly recommend these areas of terrain be optimized, either by their original designers or someone who is willing to do a pass on that, in order to maintain stability. Additionally, the triggers I used for the weather set-up could probably be tweaked a bit to reduce view distance and terrain rendering detail if the issue remains once the terrain has been optimized (I have tested these values extensively in the past however and have determined them to be okay, provided the terrain is optimized as well as possible).
The only other thing I noticed which could lead to trouble is the Palette Count, which is currently at 80 out of 98. It might be a good idea to combine some redundant palettes and use the CE HD texture function to replace any textures which lose too much colour.
Also, TresGuy - how did you determine that hppav's buildings were causing crashes? I've never noticed them causing trouble in other past levels.
On a side note, the newest changes look good. The adjusted mountains feel a lot better, makes things seem less overly-huge. Thanks for removing that crappy motel of mine...we can always bring it back if it's popular enough, provided we can't come up with a replacement.

I am sad that hppav's buildings had to go and hope the optimization of the level improves so they can return.