The nebulae shown in Stellarium are anly superimposed textures. If there are no textures of the object there will not be a display. The particular nebulae you mention are not seen from the northern sky so they are not in the default package.
If you wish to see those two particular nebulae in stellarium down load the auxiliary textures package. Try this and follow the instructions. This package contains textures from some of our IIS members adapted to Stellarium, NGC3372, LMC, SMC, NGC2070, IC2944, IC4628, NGC104, NGC5128, NGC5139, rho ophiuchus, NGC6744 and many others
http://barry.sarcasmogerdes.com/stel...mnebulae-1.ZIP
In the future there will be textures of the whole sky from the digital sky survey
If you would like to see what this will be like You can download this patch to version 0.10 and follow the instructions
http://barry.sarcasmogerdes.com/stel...oast-patch.zip
Barry