There doesn't appear to be any in-app lessons embedded in my new version.
When I try and launch any of them, all I get is a new blank html document.
The in-app lessons do appear fine on my machine.
Are you saying :
1) That the lessons panel is blank?
2)when you launch a sample from the lessons panel it opens a blank document?
If you are still seeing this please do mention the OS & language for your installation.
There was no lesson panel, even tho it was ticked in the window menu.
Checking and unchecking it had no affect either.
Restoring the default layout has corrected it now.
Good to know this is working for you now.