Build not possible for ONE project

General
1

Currently I’m working on an example project for the Valentina guys to demonstrate a problem. Suddenly the build button and corresponding menu entry isn’t active anymore. But only for this project.

It’s a vanilla desktop project. Is the project corrupt?

Mac OS 10.10.2, Xojo 2015r1.

2

Are any build targets selected?

3

Yeah, just noticed that, too. Don’t know how I lost this. Rather unintuitive.