Sorry for your undermined experience . (As usual angry users speak louder than happy )
CAD data exchange is often extremely challenging, so issues are possible, I have to admit. Some formats may have current limitations (like range of supported CATIA versions). STEP should be fine so I particularly regret about the STEP-related bug.
I and my team would appreciate reproducers - files that provoke those issues. Best of all would be to send files via WeTransfer or alike to support at cadexchanger dot com and send some accompanying info. Thanks to all who already recently did that
We will try to periodically monitor this thread but direct emails will always be preferred. We make public releases four times a year and enhancements and bug fixes are always included. So please do check in even if this current version is far from perfect.
(Founder and CEO, CAD Exchanger)