Walter, The posts with John McKernon (8-10-2006 to 8-11-2206) might be related (although those are intel macs). My own app runs everyday and uses the SOUND "resourcename" several times a day with no problems (dual G5 power mac on OS X 10.4.7). Having sound issues in quicktime movies when FB is presumably not involved suggests strongly this is NOT an FB issue. Do the maintenance scripts mentioned also repair permissions? It wasn't mentioned specifically. This seems to magically fix some failures. My suggestions are: 1) Run fewer tests (maybe one) and run the same test on all machines. a) create a one line FB program just with a SOUND statement in it. Build it and use for your test. 2) Check the logs for messages related to the test 3) Go to MacFixit (and there are other sites) and search for similar issues. Brian S.