Maxthon comes with a version of Adobe Flash to ensure the browser is able to play all Flash content upon installation, although this version isn't always the most recent. This is to ensure that any issues related to new releases of Flash don't cause issues with Maxthon. You can force Maxthon to use the most current version of Flash by following the instructions below.
The most recent version of Adobe Flash is available from here: http://get.adobe.com/flash
The "Allow all
NOTE: The information below is for Maxthon 4.9.x & 5.x releases.
For Maxthon 4.4.x and earlier releases see this post.
Update to the most recent version of Flash from here: http://get.adobe.com/flash
The page will show that it has detected Chrome. If not, check that the default user agent is in use.
Click "Do you have a different operating system or browser?"
Select your Operating System from the dropdown menu.
Select "FP for Opera and Chromium - PPAP