Comment 5 for bug 1174909

[Corrected version]
Output as well as export results vary depending on cairo version:

Tests with Inkscape 0.48.4 on Mac OS X 10.5.8/OS X 10.7.5:
cairo 1.10.2: objects <= 0.001 mm missing (local test)
cairo 1.11.2: objects <= 0.001 mm missing (thin_boxes_Win7.pdf)
cairo 1.11.4: all objects visible (local test)
cairo 1.12.2: all objects visible (local test)
cairo 1.12.8: circles < 0.018 mm missing (is.pdf)
cairo 1.12.14: circles < 0.018 mm missing (local test)

Results are the same whether saving a copy as PDF or printing to file via GTK print dialog.