I'd like to preface the below by saying that I have been a happy user and admirer of Logic for a decade (although, progressively less happy with each passing year): Having just suffered the loss of 3 days work for a client due to a serious bug in Logic Pro, it occurs to me: has anyone ever successfully claimed compensation from emagic for loss of earnings? At the moment, to me it certainly doesn't feel like an unreasonable request. I suppose that the only concession I can make to any blame on my behalf is for not saving my work out as a *new file* often enough, although I habitually save ("apple/s") my files every 5 minutes or so (hence, the backup file had corrupted too). If this was a one off event then I'd be happy to overlook it, but serious bugs seem to be becoming more and more frequent. As has been mentioned before on this list, perhaps emagic should dedicate a development cycle purely to fixing bugs and forget about cramming new features and with them, more bugs? Also, just a cautionary note on how I think this particular "circular structure" bug occurred on this occasion, in case it helps others avoid the same problem. (this was done with "show selected sequences only", although I don't know if this is relevant) 1) Created a number of sequences with notes in, and selected some of these sequences 2) Opened Matrix Editor 3) Double clicked in background, thereby viewing notes in all selected sequences 4) Selected one of the notes 5) alt/dragged the note to another area in the matrix 6) "Circular Structure" error, followed rapidly by complete file corruption, including corrupt "undo history". Any operation within Logic will result in a repeat of the "Circular Structure" error message. Quitting and relaunching results in immediate "Circular Structure" error message and corrupted sequences in "Arrange" page. The above is by no means replicatable every time (or even very often), but has now happened to me often enough that I have spotted the pattern now avoid this operation like the plague. Thanks, Paul -- Paul Zimmer ZAP! (Zimmer Audio Production) www.zimmeraudio.com