After EMClient reinstall I only see Today's messages

I suffered a computer crash and  had to reload my OS.  I’ve now reinstalled emClient and applied the license that I already had.  But, when I view my gmail account, i only see messages from today in the Inbox.  Some of my sub-folders show older messages but many show no messages at all.  What is going on?

Adding to my previous message.  Today, I saw messages from yesterday and today.  So it appears it has not or will not download messages from prior to the install.  But, in a small number of sub folders, I do see old messages, if they are from 2010 or older.  Trash folder shows lots of messages.  I can find no consistency.  Please help.