With an imported course, your strategy does not help me.
Having read more about problems with the Lesson module in 2.0 in the Forums, I think the upgradation brings more problems than it solves, in our case.
Also, I talked to our IT guy at work and he said these problems come at two levels:
* We are upgrading an entire existing Moodle Installation (instead of installing 2.0 as a fresh install)
* We are trying to import lessons from an older version.
From his experience with Moodle and other open-source beasts (esp Drupal) he said the quicker route would be to do a entirely fresh install and copy and paste our lesson content page by page
Sounds painful but he said it could be a year or two (if ever) before developers finally fix bugs introduced by us trying to re-use old content (both the old installation and old lessons) .