通常都应该是你使用的浏览器的问题（也许是设置，也许是浏览器本身）。换个浏览器试试看是不是这个原因 。

你可以通过查看页面源代码参考一下这里的tinyMCE设置。

页面源代码的这个地方:
tinyMCE.init({
 language:"zh",
 mode:"exact",
 elements: "txtAnswer",
 width : "580px",
 theme:"advanced",
 plugins : "safari,pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,insertCode",
 theme_advanced_buttons1:"forecolor,backcolor,separator,bold,italic,underline,strikethrough,separator,bullist,numlist,separator, justifyleft, justifycenter, justifyright,justifyleft,justifycenter,justifyright,outdent,indent,removeformat,separator,link,unlink,image,quote,code,fullscreen,insertCode",
 theme_advanced_buttons2:"",
 theme_advanced_buttons3:"",
 theme_advanced_resizing : true,
 theme_advanced_resize_horizontal : false,
 theme_advanced_toolbar_location : "top",
 theme_advanced_toolbar_align : "left",
 theme_advanced_statusbar_location : "bottom",
 theme_advanced_fonts:"宋体=宋体;黑体=黑体;仿宋=仿宋;楷体=楷体;隶书=隶书;幼圆=幼圆;Arial=arial,helvetica,sans-serif;Comic Sans MS=comic sans ms,sans-serif;Courier New=courier new,courier;Tahoma=tahoma,arial,helvetica,sans-serif;Times New Roman=times new roman,times;Verdana=verdana,geneva;Webdings=webdings;Wingdings=wingdings,zapf dingbats",
 convert_fonts_to_spans:true,
 remove_trailing_nbsp:true,
 convert_newlines_to_brs:false,
 force_br_newlines:false,
 force_p_newlines: false,
 remove_linebreaks: false ,
 relative_urls : false,
 extended_valid_elements:"pre[name|class]",
 content_css:"/css/mce.css",
 //cleanup_callback:"myCustomCleanup",
 handle_event_callback:"MCECheckIndent",
 cleanup : true
});

是浏览器的问题！

看看plugins属性中有没有inlinepopups，如果没有这个插件就会是弹出新窗口

注意以下tinyMCE版面，我用的没有你说的问题

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