Hours-old install of CiviCRM 5.25 under Backdrop 1.9. I've gotten as far as putting in the Board of Directors with dummy bio information, which I was trying to use to generate a View with a page display of names and bios. I get this, with various permutations of what table doesn't exist depending on what I'm doing:
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'B1.civicrm_uf_match' doesn't exist
Both Backdrop and CiviCRM are using the same mysql user "B1", who has GRANT ALL permissions on the B1 and C5 tables. Obviously, the data is still there when I go back to review it in the Civi interface. What to check next?