Posts: 1
Joined: Wed Aug 05, 2015 7:58 am

S3D wont start

Tue Nov 19, 2019 10:56 am


Im having an issue that popped up out of nowhere. Simplify3d wont start anymore, I'm running Win 10 and it has always worked before.

I tried deleting and reinstalling the software but nothing happens when i doublecklick the icon. Tried also to start with admin rights. The only thing I've done recently is update windows, could it be that something's changed with windows?


Posts: 394
Joined: Thu Aug 30, 2018 1:23 pm

Re: S3D wont start

Wed Nov 20, 2019 8:43 am

Thank you for the report. Please try opening Windows Explorer and navigating to the following directory:


You may need to enable hidden folders to access this directory. Once there, please try deleting the savedState.factory file, then opening Simplify3D again.

Posts: 446
Joined: Thu Oct 06, 2016 5:13 pm

Re: S3D wont start

Wed Nov 20, 2019 5:43 pm

if you are not using multiple monitors then ignore this

open regedit
look under Computer\HKEY_CURRENT_USER\Software\Simplify3D\S3D-Software
find all keys named "geometry" (there and inside sub keys) and delete them
start s3d
if it start you suffer from same bug I do :(

for me to reproduce the problem
- run on win10 with multiple screens
- move s3d to "non primary" screen
- close s3d

it will not start again till I delete "geometry" keys from registry (where it stores the windows last position) so the issue is trying to start s3d on non primary monitor...
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