I noticed something in the last few versions, not sure from which exactly. When I click to download a PDF file, but then in the Download manger if I click Open, not Download, the file is opened in new tab within Maxthon, not from the default system PDF app. In the settings I have removed all files from the "Open in Maxthon" group, but still no change. When the PDF is downloaded, it opens with the correct app, only when I try to open it directly from the download manager. I am currently using the 6.2.0.2300 version of MX6.