Problems with missing mail and empty folders

Problems with missing mail and empty folders

For last few hours when accessing Zoho Mail with Firefox or Chrome my Inbox has appeared to be nearly empty. It shows only the most recent individual mail or two, and none of the others that are also in there. Also, all folders now appear empty, when they actually are not. Folders with unread mail are flagged as such in the sidebar, but also appear empty of mail - new or old - when selected. Any help would be appreciated..! Thanks.