Answer to your issue is the when Google chrome updates its flash player causes the the spacebar issue. So the only best way to download Maxthon Browser there You will not run into any issue @ all. Trust Me IMHO
Or like by disable trying these steps .
Follow the steps below to disable the new PepperFlash.
1 ) Open the Chrome Plugins page by typing this URL into the address bar: chrome://plugins
2 ) Find the "[+] Details" button in the upper right to show the details of each installed plugin and click this button.
3 ) Find the Flash Plugin Section in the list of Plugins. There may be (2 files) or (3 files) in this section.
4 ) In the Flash section there should be 2 or 3 different versions of Flash listed. If the Flash section only has one Flash file listed, Click Here to go to the Adobe website and download and install the Adobe Flash Plugin for Non-Internet Explorer browsers.
5 ) The first Plugin listed in the Flash section is the PepperFlash implementation. You can tell that the first one is PepperFlash by looking for "PepperFlash" in the Location string. See yellow highlight below.
6 ) Find the "Disable" link and click that link.
7 ) Now Close all open Chrome windows and tabs and restart Chrome