Elusive Profile Data

I was tracking down the reason for a slowdown in a desktop project yesterday and used Xojo 2015r2.4’s profiler. Has it always been the case that former profile data that is still in the project cannot be read anymore? I sampled 4 profiles after some code changes and could only view the last two at the end (without quitting Xojo in between). The other were still existing as objects in Navigator but showed me only an empty profile when I wanted to re-vist them. Only my Mac, a new bug or has it always been this way?

Not sure I understand the question

You ran your app and had 4 profiles listed
When you click on “the last one” it shows properly
Same if you click on the immediately prior one
But anything prior to that doesn’t display ?

Is that correct ?