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It might be worthwhile to set the following event in the database as a workaround:1 person found this helpful
alter system set events '10867 trace name context forever, level 1';
You can review the following My Oracle Support note for more details if you have a valid support login:
11.2 Client Unable To Receive Notifications From 11.2 Database [ID 1310859.1]
That fixed it, thanks. I saw this somewhere (stackoverflow, I think) but ignored it because it was for 22.214.171.124, and I assumed it would have been fixed in 126.96.36.199. Schoolboy error.