I have had a similar thing lately with version 3.32 where when I first start up the dongles don't get recognized but if I quit catalyst and restart it works fine. This has only started happening since using the latest version 3.32 and running on 10.4.6. I have updated the dongle drivers even though I am still running PowerPC's but it made no difference. It has happened on both my machines as well as a rental machine that I updated to 3.32.

Cheers

Toby