Chainsaws

Chain oil leakage: I recently purchased a Poulan Pro 5020AV. After using it for the second time, chain oil started leaking. I found a puddle of chain oil in the case when I started to use it a week later. There are reports of this problem in the reviews of this saw on Loews. I checked to be sure that the cap is tight and the gasket clean. Am I overlooking something? What is happening here?

Thank you,
Bill McIntyre