Logic 9 ignores the *.component

Guys? Does nobody else have problems with Logic 9 accepting their audio unit? I made 6 audio plug-ins so far. All of them have basically the same properties, except names, plugin-codes et cetera. I only managed to get 4 of them working at the same time and it’s a real pain in the butt starting logic 100 times until it recognizes one (sacrificing another). It got better when I moved them to ~/Library/Audio/Plugins/Components instead of /Library/Audio/Plugins/Components where all my other third-party plugins are and validate perfectly fine. I tried all different kinds of things, changing the plugin code, changing the name of the bundle identifier et cetera. Nothing works - Logic 9 just accepts some plugins sometimes and sometimes not - there is no pattern I can see here. Of course if I change everything, e.g. Plugin Manufacturer Code and the Company Name, Logic recognizes it.
I think I have already mentioned that the JUCE debug demo application as well as AULAB accept my plugins just fine. Only “/(&§=)”$/&(/&%") Logic 9 does not.
In some forums users say that “start in 32-bit mode” did the trick for them - not for me, because I always use Logic 9 in 32 bit mode. I really ran out of ideas…