Quote - I would recommend using the stable 2.49b version over the 2.5x series at the moment since you never can tell if the OBJ importer/exporter will work on any given revision. If you do get Blender 2.56 download the revision from the Blender site since the OBJ importer does work correctly in that version.

I've had no problems importing or exporting from and to .obj files in 2.56a (the current release) and I've been doing a fair bit with it, including morph targets. The new interface is worth getting the head around: there are a lot of new features and "ways-of-doing-things" that would need to be learned, so I would recommend sticking with the newer version if you're not already familiar with 2.4x.

Blender's odd enough to learn even one version, two would be a bit overwhelming.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks