Problems in getting new emails

Starting a few months ago I stopped getting automatic refreshing of my inbox. What is strange is that I do receive the sound notification and even a pop up notification (if I activate it) but I can’t see the new email (s) in the inbox. The work around solution I came with was to set the replication process to occur every 1 minute. If I innactivate the replication process, the only way to get new emails in the inbox is when I press the replication button. In the past any new email was readily visible in my inbox without the need to use replication at all (or simply pressing F9). Any idea on what could happen and how to correct this? Thanks!!!