I just leave this here, in fact would it be nice to generally move information to places where its actually helpful <3

TL;DR
Arrow keys Up / Down should manipulate numeric inputs.
Sample Schema (you should be able to modify the schema based on input context)
UP: ++
DOWN: --
SHIFT+UP: += 10
SHIFT+DOWN: -= 10
STRG+UP: += 100
STRG+DOWN: -= 100

What?
blueprint designer
While designing a blueprint, i got that ...

Closing RazerSynapse is definetly solving the issue.. is this a problem with RazerSynapse hooking the game??

Currently i am using avira as antivir but the smartscreen is deactivated.
I am indeed using Razer "software". I will check this out.

Factorio not starting, no log provided, ntdll.dll faulting.

For 0.15.1 i could fix it with changing config-path.cfg to point to install dir but for 0.15.2 i cant get it to work, the funny thing is i rolled back to 0.15.1 and even this is not working anymore, dont know what to do now.

factorio ...

The problem might be the config-path.cfg. You need to disable the system read write paths (%APPDATA%)
if you delete all content and replace it with

config-path=__PATH__executable__/../../config
use-system-read-write-data-directories=false

it should work as expected.

@devs
i also can't run ...