Hi Ismael,
Is there any error/warning message (if so, a screenshot would be ideal)? I would suggest you check the Asset Tracking tool - for proper rendering, the status for XRef(s) should say OK / Found. Also, when facing this kind of problem, under the General - Forest Stats window you can check more details and it should give you a hint, where the problem is.
Thanks in advance for any further comments on this issue you can share with us.
Best regards,