One of my mods has removed collision for pipes, but I don't know which! (and probably other things)
I've disabled Sqweak through and made sure nothing with the word collision nor mask in the name are active.
I believe there shouldn't be many mods beyond Shadoy's "Singleplayer Extreme Modpack" other than AAI. The main mods installed are AngelBob's and a smattering of others (AAI, Madclown's, and Yuouki).
I don't particularly want anyone to kill an evening over this or anything; mostly asking if anyone is familiar or might be entertained by my confusion.
![Smile :)](./images/smilies/icon_e_smile.gif)
Thank you!
Bonus Points: Something's up with pipe-layer that prevents fluid from flowing in a strange way. A mystery wrapped in a riddle, wrapped in mildly game breaking mechanics!! More if interested.