Guys, when trying top make a group/component using the context menu or trying to flip something, always make sure to select more than one entity otherwise it doesn't work (the menu items are not only greyed out but don't even appear).
Make a test this way:
create a sphere
right click and find that you cannot make it a group/component or flip it.
you can still make a group/component from the edit menu or a component from the "Principal" toolbar > Component button (I consider this not necessarily a bug but an inconsistent behaviour and keep reporting it every time a new version is being tested but so far nothing has happened)
if you triple click on the sphre so that its hidden edges are also highlighted as selected, you can make group/component and flip it from the context menu.
Now as for menu items that should be available but greyed out, I have no idea what causes it. Supposedly it's a plugin (and Thom also suspected that it was his selection toys at a time) but I for instance have never experienced it although I have this plugion (as well as Twilight, which was also mentioned above).
Maybe it's not even an only plugin but a conflict between some plugins which of course, would make it even harder to spot.