Daniel
Tom and I have been talking about this off-list, and it appears that some of the measurements in question were just taking longer than expected to populate. However there were a few measurements that did in fact appear empty and we're looking into it. It should be noted though that the data is being logged, just not coming out through the API.
Unfortunately, as it's 1845h here in Amsterdam, the earliest we can visit this is tomorrow. I'll keep the list updated with what we find.