There has been something that I have noticed while working at my base, the fluidducts seem to glitch if chunks are unloaded, especially often, and seems that you cannot wrench other fluidducts connecting it. Could it be a bug with the current version? EDIT: It crashes when you remove/place ANYTHING next to the glitched fluidduct
Check your /skcraftlaucher/instances/alice1.6 deux/minecraft/crash-reports folder and pastebin the latest one, should have the exact error. I have notice some issues with TE piping in general, I have had energy conduits refuse to transmit power, item ducts eat items, and apparently they are causing you crashes. Seems that crossing chunk borders is the main cause of the issues.
Hmm... I am not sure that error is related to the issue, it *might* be... It seems to be an error with mpcp and logging in with a multiblock structure according to this: https://github.com/Chicken-Bones/ForgeMultipart/issues/139 so it may not be. I would look through the other errors in that folder and see if there are any relating to thermal expansion specifically, and that should be the error we need to see.
The symptoms you are having do not match the symptoms others are reporting for that specific error. That error occurs on login and prevents logging in if the chunks are not already loaded and there is a multiblock (like a blast furnace, not multipart like microblocks) machine, that is why I do not think that specific error is the correct log we need to resolve this issue, as your crashes happen on block placement next to a glitched TE block. Did you replicate the crash before grabbing the latest log file?
=/ was kinda hoping to see the actual error in hopes of getting to the root of the issue, but it does not seem like many people are affected by this.