Today I added orbit@home, collatz conjecture, and spinhenge@home to my projects list. I set them all to attach to hosts by default (and clicked the "attach now" button too). I have three hosts; one host attached to orbit@home (but not the other two projects), and the other two hosts did not attach to any of the new projects. I have tried a manual sync with boincstats (which completes with no errors) on each host, but still nothing. My apologies if this is answered elsewhere, but I did not see it.

OK, so detaching from BAM (at the BOINC client) and reattaching solved it.