I talked to an Apple Care Tier 2 Support person yesterday, June 5, for about one hour. He had me try (a) disabling some launch agents and launch daemons, (b) deleting some user preferences and and caches, (c) changing some Java preferences. None seemed to fix the problem for me, but he was doing the same or related things on his machine, which didn't have the problem. At one point he was able to duplicate the problem, then fix it, but then he couldn't duplicate it again. After a while he could, but then after that he was never able to solve it. When we hung up we arranged to telephone the next evening. He was sure he would have more information by then.
Today he called back. On half the Mac's in his area he either found the problem or could reproduce it, but on the other half that wasn't the case. He has escalated to the iPhoto developers, but doesn't think he'll hear anything from then before the weekend, and next week he's not back in the office until Wednesday.
He says that it's likely to be perceived as low priority, because there's a work around and my livelihood doesn't depend on it. I took that to mean that the developers might try to find out what causes the problem in order to ensure that it isn't in the next release, but that they might decide not to fix it immediately.
I will keep you informed.
Regards,
Richard