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Ran into an odd graphical glitch with curved transport belts - one row of pixels isn't rendering on one of the animation frames near the top. It looks like it's caused by a seam in the terrain as every curved belt passing that one particular line has the same glitch. This only happens at one zoom level though, which you can get if you zoom all the way in then zoom out 14 steps. I'd guess it's some half pixel weirdness.

Do you have the save?

Attached a save that starts at the flickering curved belts.

The boilers don't appear to be running on load, so you'll probably have to set up a case where they're working then cut their water supply.

Split your first post so that each bug is in its own thread.

I can't reproduce this issue. What are your graphics settings? Did you perhaps enable multisampling in config.ini?

I do not recall enabling multisampling, and I believe I had to download a full install for one of the updates as it was when the Win x64 auto patcher wasn't working, but these are probably settings carried over from version 0.10 or so, possibly 0.9. I may or may not have fiddled with multisampling way back when via in-game options, but never manually altered the config.ini myself. I do see the two multisampling entries in the graphical bit of my config.ini dump below.

multisampling=2
fullscreen=false
show-smoke=true
show-clouds=true
show-minimap=true
show-pollution-on-minimap=true
show-grid-when-paused=true
show-inserter-arrows-when-detailed-info-is-on=false
show-mining-drill-arrows-when-detailed-info-is-on=true
light-entity-info-background=false
low-graphics=false
lights-render-quality=0.200000003
preffered-screen-index=0
show-inserter-shadows=true
v-sync=true
screenshots_queue_size=10
screenshots_threads_count=1
system-ui-scale=true
custom-ui-scale=1
preferred-screen-index=255
graphics-quality=normal
video-memory-usage=all
multisampling-level=0

My video card is a Radeon R9 200 series.

And as an experiment, I changed that multisampling=2 entry to =0 and =1, completely removed the line, and ran the game at full screen at =2, but no change. Glitch still lives.

For more experiments, I turned multisampling on and it made it a more pronounced problem (along with the other lines that multisampling introduces for most people).

But that really doesn't narrow things down much, so I turned it back off and then went exploring at full zoom level. Found some more issues. I believe that some (curved and start) belt attachment pieces aren't being placed correctly with one or so animation frames. Like the animation frame itself isn't aligned the same as the other frames in the graphic files/draw buffer, but there could also be some other slight positioning issues that Radeon cards make worse to the point of being noticeable.

So more screenshots.
The last one especially shows how the shadow part of the asset isn't being positioned/filled correctly, along with the belt border line not being rendered at 100% opacity.

And since I'm poking at it, this attachment piece looks screwy too.
Shading/shadowing is off and it also looks like the piece got stretched somehow? The bottom right corner shadow is stronger than the bottom left corner shadow and the arrow isn't aligned correctly.

Edit - Oh, and for the vertical belt directly below the player character, the nose on the arrow going into the curved belt section got truncated strangely.

The multisampling value isn't used anymore, only the multisampling-level, we renamed it to make sure it is turned off unless people edit the config manually.

I tried the debug save, zoomed in and couldn't see any issue. I probably know how to fix it, but it would be a blind fix

So, I made a blind fix (the same we we fixed the tile gaps long time ago) for 0.12.7.

Let me know if it isn't fixed in 0.12.7 (once it is released, should be today).

Yep, your blind fix did the trick.

Much thanks. The flickering gap was kinda annoying to see when I was wandering around at my preferred zoom level.