The same callgrind file which be generated by Google-profiletool can be open in ubuntu using KCachegrind.
But while I open in Mac Mountain Lion using QCachegrind, noting happen.
I just found out that the Open dialog in 0.7.2 does not work any longer. I will publish a 0.7.3 soon.
Workaround: use the command line: qcachegrind <file>
I just did a 0.7.3 only to fix this bug. However, before closing, could you confirm that loading a file via
the GUI dialog is working again?