Ralph, David,
I analysed the file "Test.not" and to me it looks as if it is the same bug that is reported under "Unable to delete Sound Change events"
here.
It should be corrected with build 3.0.6-169. However, impacted files need to be fixed manually. Please see att #1. Measure 1-4 required 16 times deleting, measure 5-8 deleting of 64 times.
In attachment#2 you ill find the fixed file.
We will run some more tests to be sure that the bug is 100% fixed. Please use the latest 3.0.6-176 which was released last Friday.
Reinhold