All defined views have disappeared. What do I do?

Monday morning I woke up to my site being down. (intranet, cant show)

I performed voodoo for 2 days and finally got it back up. (literally voodoo, same code, same db. just multiple restarts of the server etc....)

Actually there was one change, the menu_router table was empty for some reason. It was so empty I could not even issue a rebuild menu command. I restored from backup. cleared cache, rebuilt the menu.

When the site came back on line. All of the views I had defined come up with a blank page. Not even the drupal_not_found page.

I think I have isolated something, I am just not sure what.

In the view.inc in the execute_display function I get a display ID passed in an args...,

But this line:

$output = $this->display_handler->execute();

returns nothing as the output.

I have added this line:

watchdog(__FUNCTION__, "Output:$display_id".print_r($output, true), NULL,WATCHDOG_DEBUG);

Which give me a line like the following:

Message Output:blockArray ( [content] => [subject] => )

So as far as I can tell it is getting what it needs up to this point, but the $output is coming back empty.

I tried understanding the code further, but began to think it was pointless, as I have not changed any of the code, either for core, the modules, or custom code.

The only thing I can think of is that it is a DB issue, but the tables all appear ok. The views seem to be stored as BLOBs, so I can't see what is in them to know if they are all right.

Does anyone have any advice on how to debug or better yet fix this problem?