Hi Yves,
I think that what is happening is more complicated than just the plug-in because the error seems to come from your asio driver. The plug-in itself should not cause the driver to throw an error. Perhaps the problem is related to the buffer size you are using? Can you try to increase the buffer size in Logic and see if that fixes your problem?
Just for kicks I downloaded asio4all 2.11 and tried it on my Windows 7 machine and it works fine with UC.
