Do you have any errors, additional info, screenshots, model file type etc. Am assuming you have dx9 v 0.9c installed
I have had similar 3d loading issues, but add in error trapping code (using STYX plugin):
error trapping off
load object entityinput$+"\"+modelname$,eo
err=get last error()
if err >0
warningmessage "This object cannot be loaded. X file issue maybe? Trying putting file through MESHVIEW/MENDER"
endif
error trapping on
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