Geometry Error / Crash when importing STEP file into KS3

[Pedro_Julio]

I'd really appreciate any feedback on this issue.  I've promised to deliver several product renderings and suddenly find myself unable to finish the job.  Lately I have been getting this error message more and more often when trying to import STEP files into KS3:
____________________________________________________
Problem signature:
  Problem Event Name:   APPCRASH
  Application Name:   luxion_geometry.exe
  Application Version:   0.0.0.0
  Application Timestamp:   4ff300c6
  Fault Module Name:   luxion_geometry.exe
  Fault Module Version:   0.0.0.0
  Fault Module Timestamp:   4ff300c6
  Exception Code:   c0000005
  Exception Offset:   0000000000807c2e
  OS Version:   6.1.7601.2.1.0.256.48
  Locale ID:   1033
  Additional Information 1:   2904
  Additional Information 2:   2904f9aec0114ce9f14900054803d195
  Additional Information 3:   bbbd
  Additional Information 4:   bbbd7913226fcbb7fb0dc72b83f8005e
____________________________________________________________

And when I try KS2 my models import in an exploded and nonsensical form:

[Chad Holton]

Hi Pedro,

Are you using the lastest version of KS3 (3.3.33)? Also, would you be able to send the STEP file to support@luxion.com? If so, please use https://keyshot.wetransfer.com?

Thanks,
Chad

[Pedro_Julio]

Yes, I am using 3.3.33.
Unfortunately I'm prevented from sharing the file due to legal agreements.  I was rather hoping this was a known error with a known solution. 

Just to add a little info; I use Inventor 2013, then export as a STEP file because 3.3.33 won't open my native Inventor files without causing problems.  (certain parts will open as giant spheres.)  The STEP files had been opening just fine for more than a year, until last week, when this error started.

[Pedro_Julio]

Holy crap it just opened. 

I didn't change anything.  It just opened.  I'm curious as to why, but I don't really have time to delve into it at the moment.

When I am done I will try and create a non-proprietary model that will replecate the error, so that I can share it with you.

Thanks for the fast response, Chad.

[Chad Holton]

Not sure why that is happening. 
Yes, if you ever have a moment, please share a file with this issue.

Thanks,
Chad