@bp2008
I just selected 35 alerts, all on the same day between 1:30pm and 4:06pm. After it throws the error, all the alerts appear there and are still selected. I refreshed the alert list, and 24 disappeared and 11 of those clips remained. The ones that remained were the older ones, between 1:30pm and 1:42pm. I reselected them, and was able to delete them with no error.
As another experiment I just selected another group of 25 alerts and they deleted fine. I selected another 26, and it threw the error. I didn't refresh the list, but kept the 26 alerts still selected and deleted again. It failed again, but with another record number. I then refreshed, and one clip remained, and was able to delete it.
Last experiment, selected 29 alerts, got the error, noted the alert record. Delete again, failed on different record. Deleted again, failed on the same record as the 2nd attempt. Repeated attempts fail on the same 2nd record after the first failure.
I'm thinking it's some kind of random delay between UI3 and BI, UI3 telling BI what alerts to delete vs UI3/BI knowing what clips are still there. I don't think it ever happens when deleting a single clip.
This also happens locally directly on the BI machine when using UI3. Not just remote.