Current dosing is 160mg/day - less than half the dose at which a seizure was observed.
Here is the description of the seizures from the earlier trial:
Two witnessed seizures occurred in patients taking doses of 600 mg/day and 360 mg/day. Both patients were taking concomitant medications that can cause seizures. A possible but unwitnessed seizure was reported in a patient taking a dose of 480 mg/day.
I'm guessing they might have mentioned it if there were any significant number of seizures in this latest trial. But I suppose there could have been a couple and they are waiting for the publication to disclose details.