gedward,
depends. the newer threads tend to default to "Daily", so you should be getting an update at end of each day. do you normally get them instantaneously?
at top of page, you have "Quick Links", choose "Subscribed Threads". see what they are set to.
BSD: at the top of the page, there is an option "User CP". within that on the left you have "My Control Panel". within the "Settigns and Options" you have "Edit Options".
Find the "Default Thread Subscription Mode", and select from the options the relevant one; one should be "no email updates".
Hope you had a good week (at least better than mine). have a great weekend.