Loading a raster using QGIS into a PostGIS2.0 enabled database
celenius,
It's quite possible that the QGIS raster loader hasn't been revised yet to fit with the new changes we have in place. I suggest trying the raster2pgsql.exe packaged with the latest windows experimental. It should load tifs just fine.
Instructions here.
http://www.postgis.org/documentation/manual-svn/using_raster.xml.html#RT_Loading_Rasters