Chiming in here as well with same reason as others. Converted files are problematic. It has affected our wall styles/textures/section viewports.
Rule of thumb for us is to never switch versions in a projects life cycle.
With regards to the OP's topic header, Yes we have been using BIM successfully.
Our workflow still incorporates 2D overlays still (wall cuts/flooring/insulation), in the 'annotation space' of viewports.
One more trick is to set the Sheet Layer / Viewport Resolution to something really low (like 10 dpi) until you get things set up so that the lighting/view is to your liking. Then turn it up to do the fine details. The preliminary renders will be much much faster.
Make sure to get in touch with firstname.lastname@example.org in that case, there may be an issue with your installation, once I configured everything as described here I was able to insert the symbol without issue.