volgens ben reynolds.
There were at least two changes to Lesson in 2.3.2
http://docs.moodle.org/dev/Moodle_2.3.2_release_notes
Not sure how major they are, but, if they changed the database tables, that's probably the source of your time out. Sorry to say, I don't know what a fix might be.
I'd write the folks who did the 2.3.2 Lesson fixes, or ask this question in the Lesson forum.