Jeroen,
We're investigating another issue related to that function now, but have a temporary workaround that should work for you now. Please edit the /plugins/system/jfbcsystem/jfbcsystem.php file. At line 42, you'll see:
if (!$app->isAdmin())
{
jimport ....
.....
}You'll want to comment out the first 2 lines and last line by putting two slashes at the beginning of the lines. Don't touch the 10 or so lines in between there.. when done, it should look like:
// if (!$app->isAdmin())
// {
jimport ....
.....
// }We're looking to release 4.1.1 later this week or early next which will clean up a few minor issues that are cropping up, and this will definitely be one.
Sorry for the inconvenience, please let us know how it goes, and thanks for the report,
Alex