If you are not receiving email notification for replies in topics that you have subscribed to, please find the fix for it below:
Go to: My Settings > Notification Options (or click here for the direct link)
Make sure the "Email" option is enabled for Notification Methods. Even if it is already enabled, just click "Submit" button. You should receive the topic reply notification emails after that.
Note: This issue affects some members after the upgrade to v3.2. It is a one time fix.