The underlying reason is that these projects don’t appear to offer public access to their source code repositories. However, instead of disclosing this fact intelligently, Ohloh simply showed a blank report.
I’ve now checked in a new feature that enables people to specify if there’s a public repository available and whether Ohloh fails to support their specific SCM.
I’ve decided to make the “no public repository available” fact have a yellow warning symbol next to it – since it tends to indicate that the project doesn’t offer full transparency into its development process. I’d be curious to get your opinion on this.