Of course, I had also thought that weird default values could cause the problem. But I confirm that both active "Advanced Options" had been (apparently) set exactly the same on both APG 2.0.9 and 2.5.0 A1 after having pushed the reset-to-default button. I have used these default settings from then on. So I believe that the root cause of the flaw is elsewhere unless there is an anomaly in the "setting options" software module of Alpha1.
Well, I think there is something very unclear...
When Autopano knows that the lens is a fisheye, rather than selecting the "standard" default parameters it uses the one shown in the first capture (and they are strange, IMHO)
Then, if you push the Restore Defaults button you get ordinary (non fisheye) default values- shown in the second capture - and this is a dubious behavior as the lens is still considered as being a fisheye
I believe there should be several default values (for example one for fisheye, one to be used when many source images have been loaded (mosaic) and a third for ordinary panos.)Though Autopano is not supposed to be used this way, for 360x180 panos I always look first at automatic circular crop circles and alway adjust optimization settings before hitting the Detect button because by doing so I avoid many failed attempts!