I've found when trying to fix errors that come up during import diagnostics that it's pretty common for SolidWorks to be unable to fix the problems.  Most of the time, it doesn't matter.  The imported part is still usable.  However, after the fix fails, maybe half of the time the warning icon (the yellow triangle with an exclamation point inside) remains.  Once a fix is attempted, regardless of the results, the icon is of almost no value.  It's just an irritation.  Is there any way to turn this icon off, or to make it clear to the software that you are aware of the problem, tried to fix it, and will just accept it as it is?  I know you can block the pop-up warnings, but I want the icon itself gone once it's done its job.