I have some issues adding notes to Leads using the API (as shown in Insert notes and relate to the primary module )

I'm using curl with PHP to add a lead, and in the response I get the lead ID. After that, I'm trying to make another call to add a note and I use that ID from the previous response as the entityId for the note. I get a 'Record(s) added successfully' response in both requests, but I don't see the note set to that Lead. I've searched around the forums and I've seen some people mentioning adding SEID to the request xml for the note, but it didn't work either.

A thing to note (pun not intended) is that when I search for 'notes' in the CRM I get a list of notes (I assume it's the ones API calls created), but they're all empty, including the title and content. And when I try to click on the pen (edit) button, the modal window just keeps loading and hangs there saying 'Please Wait...'

Some help would be appreciated.

Thanks!