Target and start items not working

Has anyone an idea why?

Can you paste the code you used, like

[RSSImport display="10" feedurl="https://your_feed_url/"
displaydescriptions="true" html="true"
start_items="<ol>" end_items="</ol>" paging="true"]

or

RSSImport(
    $display = 5, $feedurl = 'https://bueltge.de/feed/',
    $before_desc = '', $displaydescriptions = false, $after_desc = '', $html = false, $truncatedescchar = 200, $truncatedescstring = ' ... ',
    $truncatetitlechar = '', $truncatetitlestring = ' ... ',
    $before_date = ' <small>', $date = false, $after_date = '</small>',
    $before_creator = ' <small>', $creator = false, $after_creator = '</small>',
    $start_items = '<ul>', $end_items = '</ul>',
    $start_item = '<li>', $end_item = '</li>'
)

What version of the plugin are you using?

<?php RSSImport(
$display = 10,
$feedurl = 'https://loeffelstiel.eu/feed/',
$start_items = ' ',
$end_items = ' ',
$start_item = ' ',
$end_item = ' '
); ?>

I use Version 4.4.14.

please try

<?php RSSImport(
		$display = 10,
		$feedurl = 'https://loeffelstiel.eu/feed/',
		$before_desc = '',
		$displaydescriptions = 0,
		$after_desc = '',
		$html = 0,
		$truncatedescchar = 200,
		$truncatedescstr$truncatedescchar = 200,
		$truncatedescstring = ' ... ',
		$truncatetitlechar = '',
		$truncatetitlestring = ' ... ',
		$before_date = ' <small>',
		$date = 0,
		$after_date = '</small>',
		$date_format = '',
		$before_creator = ' <small>',
		$creator = 0,
		$after_creator = '</small>',
		$start_items = ' ',
		$end_items = ' ',
		$start_item = ' ',
		$end_item = ' '
	); ?>

It shows me a white page.

ups, my fault. There was a typo in my suggestion.

please try

<?php RSSImport(
		$display = 10,
		$feedurl = 'https://loeffelstiel.eu/feed/',
		$before_desc = '',
		$displaydescriptions = 0,
		$after_desc = '',
		$html = 0,
		$truncatedescchar = 200,
		$truncatedescstring = ' ... ',
		$truncatetitlechar = '',
		$truncatetitlestring = ' ... ',
		$before_date = ' <small>',
		$date = 0,
		$after_date = '</small>',
		$date_format = '',
		$before_creator = ' <small>',
		$creator = 0,
		$after_creator = '</small>',
		$start_items = ' ',
		$end_items = ' ',
		$start_item = ' ',
		$end_item = ' '
	); ?>

I’ve updated the docu to point out how php expects the parameters to prevent such misunderstandings in the future.

“Please note that for the PHP function the parameters are expected in the order in which they are defined in the above list. Thus if you skip one parameter, you will also have to skip all of the subsequent parameters.”