Aperture 3.2: renaming based on date/time doesn't work properly

Question

While importing I rename my photos based on the date/time they were taken.
In Aperture 3.1.3 this worked perfectly fine; for photos taken within the same second Aperture added an index number for the second, third etc. photo automatically.
In Aperture 3.2 this doesn't work any longer; Aperture simply doesn't import photo number 2, 3 etc. of that particular one second.
Note: I store the original files outside the aperture library, all run under snow leopard on an iMac i7. And as I said this worked fine under 3.1.
Does anyone have an idea?

Answer 1

Thanks all for the response
Leonie, here are the details of what I do/experience:
a) Aperture message after import
b) I import pairs and rename them as follows “IMG_{Image Date}_{Image_Time}” (I know all the disadvantages of this but old habits are hard to break… and for me it still works fine)
c) Difference of the images that are imported / not imported is solely the hundredth of the second when they were taken. Of my test series only the first image has been imported:
DSC_4903.jpg(2011/10/19 22:49:50.08)
DSC_4904.jpg(2011/10/19 22:49:50.25)
DSC_4905.jpg(2011/10/19 22:49:50.43)
DSC_4906.jpg(2011/10/19 22:49:50.60)
DSC_4907.jpg(2011/10/19 22:49:50.80)
d) I import via the import panel: Import in new project – storefiles in particular folder (not Aperture library) – subfolder ‘imageyear/month” – rename as described above – import both
Doug, after some trial and error I agree with your thoughts, Aperture apparently simply lost its automatic indexes ‘-1’, ‘-2’ etc. and – what is good - doesn’t overwrite the first with the second and the third image... As you suggest there are different options to make the images unique. Most simple would be to add {index #} or {sequence #} or {counter}, all would do and I probably will choose one of them. Or I will downgrade back to 3.1.3 (do have backups) and wait until Apple fixes this.
Kirby, turnoff “Don’t import duplicates” was a good idea but didn’t solve it. But your naming convention actually ensures the uniqueness of the files.
Michael