We're running into an odd issue with the latest MEGAN release (Ultimate Edition, v6.8.15), via Linux. We have a very large number of samples (68), and have been able to all of them if we bump the memory up enough for comparison. What is unusual is that the 'Comparison.megan' file cannot be saved (the 'Save as...' is greyed out). This worked in past releases.
I have also tested this on Mac with the same version and have the same issue, even with smaller samples. Any reason this was disabled, or is it a bug?