Today I've released an update to resolve issues with eastern language encoding in Articles & News admin. The issue was found to be caused by the use of htmlentities, a function we added to allow tutorial writers to write character codes. So ideally a replacement function was needed, and I've written my own variant, phpentities, it does what is only needed, and is far less destructive.
As this is not yet officially integrated, I'm releasing these files as a seperate update, I'd like those of you running v5 in eastern languages such as Russian and Polish to try it out, if it works as expected I'll implement it officially. The update, Entities Fix is available in the downloads area under PHPFusion Core. Thanks!