When I logged into my orcs, I had 750 wood, but wall construction had stopped. I had to click resume wall construction, like I did every other time, to start it up again.
Also, yesterday I had started on a motte wall for my humans. But when I logged in today, not only was there no work getting done on it, it didn't even exist! But the resources (and wealth) I had paid for it were still gone.
Hope this helps.
That was so funny, I laughed twice.