I am having some trouble with my Zimbra e-mail inbox. Within the last few weeks my inbox will now only show a few e-mails. I can no longer scroll through multiple pages of messages from various dates. Instead, I only have one page of inbox, and the number of e-mails keeps mysteriously shrinking without me deleting anything. I know the e-mails have not disappeared, because I can still search for messages from a certain person, and it will pull up all previous messages. However, this is somewhat of a pain...

Any idea what has happened? Is there some setting that is doing this that I can change?