Had the same problem with relative links. While you’re waiting for an official release, you can fix this manually by adding one line to wysiwyg-text-widget.php in your wp-content/plugins directory. In the tinyMCE.init() function, add relative_urls : false,
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The code is around line 55 (and the fix is the 3rd line down):
<script language="javascript" type="text/javascript">
tinyMCE.init({
relative_urls : false,
mode : "specific_textareas",
editor_selector : "mceEditor",
width : "457px",
theme : "advanced",
theme_advanced_buttons1 : "<?php echo $mce_buttons; ?>",
theme_advanced_buttons2 : "<?php echo $mce_buttons_2; ?>",
theme_advanced_buttons3 : "<?php echo $mce_buttons_3; ?>",
theme_advanced_toolbar_location : "top",
theme_advanced_toolbar_align : "left"
});
</script>