Nevermind, saw a bug report for this issue. Not sure how I missed it the first time. Couldn't find a way to delete this thread. Mods, please remove this. Thanks!
When I upgraded from 2.1 to 3.2.1, the WHEN clause in a trigger disappeared from view. In its place was a blank line.
Upgrading from 3.2.1 to 3.2.2 took away the blank line but still kept the WHEN clause hidden.
Downgrading from 3.2.2 to 3.1 displayed the WHEN clause again.