I converted to Jepp when AsA changed format. I think this was 2006 /7. Since then I think amendments (I have 2 services) have been late 3 times. Once was an issue Jepp had with the overseas mailing house and the other 2 have been local mail issues, one of which Aust Post owned up to and the other not, but I'm sure it was the local delivery guy.
Have you rung Jepp? I've always found their customer service excellent.