The icon in gnumeric-1.8.4-1.fc11.x86_64 is missing so an icon on the panel has a big black square rather than the expected spreadsheet icon. The icon in the menu is missing as well. The worked fine in 1.8.2.
it seems who ever bumped gnumeric did not include the older desktop patch.
Its fixed now!!
gnumeric-1.8.4-5.fc10 has been submitted as an update for Fedora 10.
gnumeric-1.8.4-5.fc10 has been pushed to the Fedora 10 stable repository. If problems still persist, please make note of it in this bug report.