Hey, I just downloaded to Unity 5 plugin for web and immediately noticed that “Development Build” is stamp in the bottom right corner of the Unity Window in all of my projects. How can I remove this, it is placed in an unfortunately bad place.
Well, played around a bit with this. When I installed Unity5 editor the webplayer plugin was updated. Version 5.0.0f4
I went to the Unity webpage Unity Real-Time Development Platform | 3D, 2D, VR & AR Engine to view my stats - even on the webplayer they have on settings I saw the Development Build tag.
Then I re-installed the plugin from Unity Real-Time Development Platform | 3D, 2D, VR & AR Engine over the one installed by the editor upgrade.
By doing this it made the Development Build tag go away on all sites. 
Hope this works for others.
Robin
Press ALT + Right Click on web player, go to Release Channel and uncheck Development.
This needs to go away. Recently we did the Unity5 upgrade too. I was one of the last to do the upgrade, did not notice this until we’re at a trade show last week, and all of a sudden ALL of our web player demos are sporting “Development Build” in the lower right corner!! Was never there before, W. T. F. ? Turns out it’s a default Player setting, that has to be turned off at the local machine’s configs. I can see putting up with watermarks using free versions, but a paid license? No way. There should be NOTHING unwanted on screen, no matter what. This should be turned off, today.
In build settings check development build and then build the project, then uncheck the development build and build again.
Uncheck development build in the build settings, you can see an example of the windows in the Unity Manual for Publishing Builds.
