Recently did the latest 21H1 update, along with updating my AMD drivers to 20.6.2 - I'm having crashing issues with simplify just closing with no error messages, I tried rolling back to the 20.6.1 AMD driver, no change, so I'm wondering if it's the latest windows updates, anyone else having problems?
Have you tried exporting your profiles with File > Export FFF Profile and then using Help > Reset All Settings? This will revert Simplify3D to its stock configuration.
After this is done you can import your saved profiles with File > Import FFF Profile(s).
"A bird does not sing because it has an answer. It sings because it has a song."
Not sure if this is connected with the reported issue here....but there have been reports of issues printing to Sillhouette Cameo 2D cutting devices since a recent update to Windows. Microsoft have acknowledged the issue and may be working on a quick fix to the fix!
I've had problems wring to my Cameo....and removing the updates KB5003537 and KB5004945, tthings started working again. I have no issue with S3D...but that may not be an indication the windows fixes are not responsible.
Update: The fix with the issue is KB5004945, and it was patched on the 6th July 2021