Permissions on the file system (i.e. 777) have nothing to do with it... The issue seems to be that you have an old cached version of the JS files on your client (or at least that was the issue for the olegp). You need to clear the cache on your browser so that it works properly.
I would also suggest that Inspirer changes how the code works a little by appending the version into the JS file names as this is quite likely to cause issues across the board during upgrades due to how browsers handle caching. I'll let Insiprer know about this.