Inkscape has a bug where it only exports a white page when duplicates / clones are present on the page. To get around this do:
– Edit > Clone > Unlink Clone (Shift-Alt-D)
Also, while I’m on it:
Scale many objects around their individual centres:
– Ungroup Objects
– Transform Menu (Ctrl-Shift-M) > Scale
– Tick „Apply to each object seperately“
Thanks to SMBiggs on Stackexchange.