Problems after updating to Joomla 3.4.1

All you needed to do was upgrade through Joomlas built in upgrade component. 3.3.1 to 3.4.1 is not a migration. Do not use migration extensions unnecessarily or you risk damaging your install.

Done now - I'll know better next time :blush:

You need to provide the full code that your form is trying to execute. I can't suggest anything without first seeing what it's missing or trying to do with CBs API. My guess is you're missing an import somewhere maybe.

I don't know what changed, but my problem is now sorted. It needed
// load the CB API
include_once( JPATH_ADMINISTRATOR . '/components/com_comprofiler/plugin.foundation.php' );

which previously was not required.

Regards, Phil

That should've always been required as that loads CBs API in. I'm guessing at some point something else was present on the page that was loading it in for you.