Place a fast splitter and a stack inserter inserting into one side of the splitter. Items from the inserter end up on both splitter output belts, as expected.
Set priority output on the splitter. (I prioritized the "far" side from the inserter in the screenshot, but it doesn't seem to matter ...

0. Use default settings for "Build" and "Drag map" (left mouse button).
1. Pick up a blueprint from the blueprint library (hand icon remains in library).
2. Go to map view; mouse over a place where the blueprint can be built (in radar range, no obstructions).
3. Left click. The blueprint does not ...

sandboxC.png

I've found some arrangements where adding stack inserters that remove items from a belt between a source and a sink (in this example, infinity chests with loaders on both ends) somehow reduces overall throughput, even though there are still large, visible gaps upstream of where the ...

Good to hear. Thanks for looking into this.

I see a desynced-level.zip in the report I submitted, but I take it that's not the reference level. Is the desync report supposed to contain the reference level? I see only one "level.zip"-looking file in each desync report I get, out of 5 files total (info.json, replay.dat, log.txt, desynced-level ...

Reproduced on a fresh 50x50 world in 0.14.23; desync report attached. Shift-clicking allowed me to place it without a desync--thanks HOSH (I thought I had tried that, but I guess I didn't).

Tried to reproduce on 0.15.6 (figured you'd want the latest, let me know if not), but it did NOT occur. I'm ...

Yes, this is new to 0.14.23 and did not occur on 0.14.22.

Playing on Linux (Ubuntu 16.10, downloaded via Steam) and connecting to a headless server (Ubuntu 16.04.02). No mods active. This issue did not occur in 0.14.22.

First saw this on a world that had been created on 0.14.22. Existing blueprints with roboports caused an immediate desync when I tried to ...