@XCoach at this time I am not aware of any other solutions at this time. Can you do the same test to see if a new list repeats the same problems?
My image/response when trying to delete is similar to the one posted in an email that follows this one. I too hope I do not have to redo the complete list in the group. I also tried a different browser and got the same problem and error response. Has this problem with shaw webmail been remedied yet?
@CJG at this time I'm not aware of any new remedies to bypass this issue as it has to do with the specific contact within the list.