By 'fixate' do you mean not change? The 2.6 online builds are updated occasionally to incorporate bug fixes and new features, especially as 2.6 is still under development. If you want a static build, please use 2.5 until 2.6 is the main release, at which point it will be updated less frequently.
hi edward, we are aware of the fact that 2.6 is not stable yet but prefer to use it over 2.5. On the forums I had discussions with steve about the changing buildnumbers of the online edition. When a buildnumber (that is used in one of the html codes that we get from the visokio link builder) is removed from your server, the html code doesn't work anymore. Steve let us know that if we do want to keep a single buildnumber, it would be possible.
Absolutely. Any time you want to "freeze" a build number, let us know which one (after you have tested it against your files). We will create a permanent copy of it in a different area of the website.