I just test-posted a private entry and it worked fine. And since I use the same icon keywords on both journals, the correct icon was used in both cases as well. The one thing that didn't work was that the tags didn't post to the secondary journal (in this case InsaneJournal). Or, it could be that you can't update with new tags from Semagic to IJ, I don't know. I'll have to try using IJ as the primary journal sometime, just to see.