Later features cannot cause earlier features to fail. If earlier features fail, that is because SolidWorks did a "full rebuild" and found errors. Sometimes when adding new features, SolidWorks does not properly account for changes or paramters of existing geometry correctly. It helps, every once in a while, to do a CTRL-Q rebuild. In your instance, I would also temporarily turn on Tools>Options>System Options>Performance>Verification on Rebuild. Then, do a CTRL-Q rebuild. After, remember to turn verification on rebuild back off.
This will rebuild the entire model with advanced face/body checking, which will make sure you have a good model.
Also, make sure you ran import diagnostics on the imported surface. You can do this by right-clicking on the imported surface, and chosing Import Diagnostics.