Comment 13 for bug 315732

I did the upgrade as you mentioned. The first time I pulled up Lightning it did the same behavior with showing past reminders that had been acknowledged by other clients (with the repeat sounds, holding true to the bug you mentioned). When I clicked "dismiss all" it gave me one after another window of "this item has already been updated, discard changes and reload or submit anyway" (paraphrased). Eventually I got sick of escaping out of that, so I killed the process. After this things appear to be working okay. I guess the problem still remains with alerting the user for events that were acknowledged by other clients when running a new version/installation of Lightning for the first time. Thus far I haven't had the empty window come up, as the previous version did.

I did find that the workaround I used for the older version of Lightning stopped working after scheduling events with reminders then acknowledging them. My hope is that I don't run into that with this version.