TESTED - There now follows an Official Hyena Loony Bug Report...
Firstly, thanks for doing this - I know you didn't JUST do it for my benefit, but thanks anyway.
Basically, the new set works fine, no weird glitches whilst cavorting round tunnels.
The tunnels themselves are PERFECT and look absolutely great. Seamless join so far as I can tell.
There is however a very slight lava line where the original geometry joins the ceilings on all the larger chamber tiles. Very minor and only really showed under some of the lighting conditions I tried. Barely even worth mentioning and I do so only to be thorough.
A few small problems did manifestomizate themselves at me, however...
EMITTERS:- Half the emitters in the set have gone weird. As you can see in your second image on the previous page, the little vapour clouds have become reekingly strange clouds of luminous squares, which look a bit silly.
Observing the emitters in detail via the miraculous Rabidonic Hyenascope TM, the emitter problem is easily solved.
The emitters use the texture "fxpa_smoke01", but for some reason, half of them in your version have become "fxpa_smoke01.001". This causes the eeeeevil squarism. I reset the emitters back to "fxpa_smoke01" and sure enough the little vapour clouds are back to normal... Just don't ask me HOW the anomalous ".001" crept in like a filthy Spleen.
VERY MINOR:- In the Big Chamber, tile "tib01_p01_01", a smallish triangular patch of lava shows through the ceiling mesh. More or less directly above the floor vent thing.
NOT QUITE SO MINOR:- Though the basic tunnels are all fine, there are some problems involving junctions with Doorways.
4 Way Junction with 1 Door "tib01_a20_01" - There is a hole in the roof over the junction, even in the lava.
4 Way Junction with 2 Doors "tib01_a19_01" - Big patch of visible lava on roof over junction.
(4 Way with 3 and 4 doors are fine).
T Junction with 1 Door "tib01_b15_01" - Hole in roof over junction.
T Junction with 1 Door "tib01_b17_01" - Hole in roof over junction.
T Junction with 2 Doors "tib01_b13_01" - Lava patch over junction.
T Junction with 2 Doors "tib01_a14_01" - Missing geometry around one door PLUS around tile edge side of non-doored tunnel.
T Junction with 3 Doors "tib01_a15_01" - Hole in roof PLUS missing geometry at the side of one door.
Thus concludes the rubbish PHoD Bug Hunt.
Hope this is helpful.
There's certainly no really, hideously major problems and, if you don't stick lots of Beholderesque Doors in, none at all once the emitters are reset.