In checkbox object, "false-value" and "true-value" have lost their values in an app saved from previous beta version.
Sorry about that. I believe that the names of those properties were changed slightly which would cause the old values to be lost. Because this is a beta, I can't guarantee that it won't happen again in the future.
As reported, the HTML code inside a Container does not shows any more.
This should be fixed today or tomorrow.
The "SetAttribute" command no longer admits "#" in object name.
This was changed to make it consistent across the interface. We don't use # for ids anywhere else so it didn't make sense to use them for the SetAttribute action.
Is there any possibility to pre-purchase NeoAppBuilder and keep working with previous beta versions?
There will be a purchase option in the near future, but it's not possible to go back to betas that have already expired. Hopefully, you won't want or need to go back.