Your rocket_pm_r was my primary big test for multithreading and belts optimization, now this perfect small test, thanks reproduced successfully.
P.S: I particularly liked cloud background over darkness when you hover roboport with mouse.

EDIT: Fixed for coming release.

Xeteth Thanks for report, however following order of groups and subgroups as they are in crafting menu would be quite tedious thing, besides it does not really matter when most frequent situation is having different counts on everything (me personally would remove count sorting altogether, so thing...

That happens when you run an older version of Factorio than that you have ran recently.

It's a known issue, and not just for robots. Will be fixed later during GUI review.

What keys combination do you use to type in ^? Is it shift-6 or some AltGr thing?

Yes.

Do you mean the save that is initially selected with cursor? If so - did you change local-time/time-zone recently?

Do you mean transparent ghosts that appear when you left-click with blueprint in your cursor? If so - that seems to work in 0.15.16 at least. Both ghost and entity that is built thereafter have 'Last user' that clicked it. Same for shift-clicking to place single ghost.

Savegame attachment would help too also, to ease out getting on same track with mods, you can .zip folder located at C:\Users\<username>\AppData\Roaming\Factorio\mods and send it as well.

Thanks for report. Replays can support big factory because this is the way multiplayer works in factorio - players actually exchange their replays as long as they play, and every such replay problem reported is very valuable because sometimes it helps to nail down multiplayer desync. I suspect it co...

Also, does copy-paste work at all in other text boxes (like stations names)?

The only way I can classify this as not a bug is to classify it as one of greatest UX trolling cases we'll fix that of course, thanks for report. Dragging will be canceled when you enter/exit map for blueprints and deconstruction planner.

EDIT: Fixed for coming release.

fregate84
Your save is a good demonstration, thanks for it core i7-2670qm
0.15.16 belts:25ms, inserters:5ms, ups:20
optimized: belts:5ms, inserters:8ms, ups:30
(and there is one thing for inserters I didn't try yet)

I think those stone furnaces (cursor coordinates 5;11-5;19) have affected your motion which has lead to further desync. When I load final game I don't see those furnaces in that spot. So, do you mean that they were ghosts forever and you and your friend never placed those furnaces for real in that s...

Fixed for coming release.

We plan to include it in 0.16 which shouldn't be far from 0.15. Optimization works themselves are finished, we just didn't want to get many ambiguous desyncs if there are any because 0.15 was a big update on its own. As an experiment I may try your save with that branch to see how much it improves t...

This is actually same kind of problem. Flickering comes from character rapidly switching between deconstruction mode (and facing entity) and whatever he was facing before.

EDIT: Fixed for coming release

NeilN
I've finally reached this issue on my todo, but for some reason can no longer replicate this problem with 0.15.16 (there were some gui-related changes, so they could fix this as side-effect). Please confirm that on your side.

roidal Belts and splitters are no longer updatable entities, it all moved to sort of "transport-line-manager" like we have for electric networks. Item position is important not just for rendering, but also for inserters to chase items and stop chasing when item goes to next belt in a sequ...

roidal Yes, waking up everything during brownout is the only option I guess (but that would cause UPS drop during brownouts), but on the other hand everything is slow anyway during brownouts, and big-factory players rarely have brownouts. Another option would be for electric network to control upda...