Getting an unusual problem developing Unity apps for use on the Web with Unity 3.5.0f5 (We've recently updated from 3.4). The problem's manifesting in a number of odd ways, but it seems to boil down to the incorrect version of the Unity Engine being installed on machines (Notable only Windows machines, Mac tests seem to work fine) that don't have the Unity editor. Been seeing this with the following repro: - Have no version of Unity installed - Access our game and get prompted to install Unity - After installation, the game starts to load but then fails with: Failed to update Unity Web Player Unity Web Player update finished, but installed revision (3428003) is less than required revision (3508005). Please reinstall. Checking Unity3d.com/Webplayer/ to see what version's installed, we get: - Unity Plugin version: 3.5.0f6 - Unity Engine version:3.4.2f3 (??) Also seen this via a manual install of the webplayer plugin from http://Unity3d.com/webplayer/, The auto-updater doesn't seem to correct this either, as subsiquent runs of the game result in the same error at the loading screen. So far, the only way around this I've managed to figure out is to nab the full installer from http://webplayer.unity3d.com/download_webplayer-3.x/UnityWebPlayerFULL.exe , download 'n install, restart your browser, and everything's now the correct version. Bit worried in terms of this error affecting people coming to the game Any ideas what could cause this? The manual fix is a bit faffy and as far as I can tell the auto-update 'n installation work, they're just getting the wrong version (possible caching issue? Something in Project Settings we're missing?) Webplayer Log output looks like: Cheers.