[nerbert]

I found the problem. You can either install the new version of the filemanager files or do the following edits in filemanager/admin.php:

On line 169, filemanager/admin.php
Find:

$password = hash('sha512', trim($vbulletin->GPC['password']) . $admin['salt']);

Replace with:

$password = hash('sha512', trim($vbulletin->GPC['sha_password']) . $admin['salt']);

On line 254, filemanager/admin.php
Find:

print( '
	<script>
	document.forms.cpform.setAttribute("onsubmit", ""+
		"var form = document.forms.cpform;"+
		"var password = form.password.value;"+
		"form.testpass.value = hex_md5(password);"+
		"form.sha_password.value = sha512(password);"+
	"")
	</script>
');

Replace with:

print( '
	<script>
	document.forms.cpform.setAttribute("onsubmit", ""+
		"var form = document.forms.cpform;"+
		"var password = form.password.value;"+
		"form.testpass.value = hex_md5(password);"+
		"form.sha_password.value = sha512(password);"+
		"form.password.value = \'\'"+
	"")
	</script>
');

I apologize for the inconvenience.