reproduced with Inkscape 0.47 (r22583) and 0.47+devel r9506 on OS X 10.5.8
Do you have 'Affect: Move gradients along with the objects' [1] deactivated in Inkscape running on Linux Mint 9 Isadora, but activated in Inkscape on Windows XP?
[1] second to last button on the select tool controls bar
reproduced with Inkscape 0.47 (r22583) and 0.47+devel r9506 on OS X 10.5.8
Do you have 'Affect: Move gradients along with the objects' [1] deactivated in Inkscape running on Linux Mint 9 Isadora, but activated in Inkscape on Windows XP?
[1] second to last button on the select tool controls bar