I encountered a pretty odd bug when I updated the mod. My background walls dissapeared. I thought this was just a one time thing because of the update, so I replaced them, but the same walls kept dissapearing. When I just walked around, some of the walls were deleted again. The walls affected were behind decorative furniture mostly, but also some blocks and platforms, and it is kind of irregular. Shown here:
http://i.imgur.com/jQUxhR1.png
As you can see, not ALL of the walls behind furniture are gone. That room in the screenshot looked the worst, it might have been around 70% gone in these situations behind furniture. And again, not all of the walls behind hammered blocks and platforms (stairs).
I updated it via the mob browser in game, and my other mods have been downloaded through the browser. The mods I'm using are:
imkSushi Mod (v3.1.1)
MaxStackPlus (v3.1)
Thorium Mod (v1.3.1.6)
Tremor Mod Remastered (v1.3.1)
Cheat Sheet (v0.2.5.13)
I also cerated a new world (same mods, same size, same crimson, same normal mode) and built a room very similar to one of my "bugged" rooms and nothing happened. I could not re-create the bug on that new world. I tried logging on a Tremor + Thorium world that is 4 months old, the walls did not dissapear. I tried logging on a 1 year old Thorium world - nothing. About two weeks ago, before I updated the mod, I copied my house from a vanilla world and pasted it into my current world with TEdit 3.9 (v3.9.16350.181 to be precise - released on 15 Dec 2016 which is a beta version and may be unstable, according to their website). So I tried copying the same house to the new world I created 30 minutes ago, to re-create the bug. Without any mods enabled the background walls were fine and not dissapearing. When I enabled only Tremor the walls started dissapearing again, I recreated the bug!
Copying a build from one world to another with TEdit before the Tremor update was completely fine, but with this new update, the background walls started to be randomly deleted. I do realize that this is a very, very specific situation for the bug to happen, and I don't have anymore info. It took me literally 3 hours trying to figure out what was causing the problem and to write this post, and I don't have time to try other versions of TEdit, other builds, other maps etc. I need some sleep
TL;DR: Copying a build/house from one world to another with TEdit 3.9 and logging in to that world with the newely updated Tremor, the background walls will start to dissapear.