The only way I can get sequential printing to work is by having fewer parts and spacing them out. This has removed a vital function from S3D. Until it's fixed or there's a way to disable this is there a way to downgrade to 4.0?
The feature added in Version 4.1 will automatically adjust the printing mode to avoid collisions between your parts. This happens automatically, so there are no additional settings you need to adjust to enable the behavior. As you noted, this allows you to easily transition back and forth between sequential printing and layer-by-layer printing based on the models that you have on the build platform, and how they interact with one another. In prior versions, this was one of the biggest sources of accidental collisions that we had seen from our users, so it was an important improvement for the software.