DSON no longer works in P12 because of the updates to Python. See https://www.renderosity.com/rr/mod/forumpro/?thread_id=2955551 if you need help removing it.

Lights issue is discussed here: https://www.renderosity.com/rr/mod/forumpro/?thread_id=2955295 Currently, pick the light and then click the single checkmark to replace the lights. Unclear why the default behavior has changed.