If you are finding that your Gmail Inbox isn’t quit as full today or if you were expecting an email that hasn’t arrived yet you might want to pay close attention to this information. Another indicating behaviors of this issue is an email where the subject line is visible but when opened the body is blank.
This past weekend Gmail switched over to their new layout and some of ad-block’s filters were mistakenly classifying emails as ads/spam and thus blocking them. If you use the Adblock plugin you can easily resolve this by forcing the subscription definitions to update.
Go into addons > adblock > options/preferences > right click on the subscription > update.
The change is immediate and you will not need to restart the browser.