You should be able to get back into the sweep, you need to select it then hit the edit sweep button to get back into the path skecth or pick mode.

Sweeps are different to the other geometry creation options because there are skecth options for the sweep, the path and the profile which can confuse users.

It seems that once a sweep is created as 'sketch' or 'pick', there is no way to change it from one path type to the other.

I can edit the path, I am trying to change from a pick path to sketch path, is there a way to do that?

Case # A:
The path of the sweep was created by "sketch path" and finished. When you do Edit Sweep, only the "Sketch path" button is available; you want to pick a path but the "Pick path" button is unavailable.

Solution: Sketch path > pick lines tool > pick the lines to define the new path, erase all the old path. The reference plane for the profile will jump to the new path. > Finish path.

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Case # B:
A sweep solid was created by "Pick path" and finished. When you do Edit Sweep, only the "Pick path" button is available; you want to sketch a path but the "Sketch path" button is unavailable.

Solution:
Home > Model lines > lines tool > create some lines and click Modify to finish > Pick path > Pick 3d Edges > pick the new lines > erase the old path. > Finish path. The reference plane for the profile will jump to the new path.

i deleted what i originally wrote in this space as Alfredo came up with an answer, thank you Alfredo!

but this is still another lame workaround, we should just be able to delete the path (and still have a 'jump'-able profile) and then have a non-greyed out option to sketch, or vice versa.

something else for the wishlist.

Thanks, all. It still seems that you can't change from a sweep from being sketch-based to a 3d-edge-based, or vice versa.

Here is why I am asking:

I can get the sketch-based sweep to flex parametrically, by tying it to a reference plane. But I am unable to get the 3d-faced sweep to flex, the path does not want to align or lock to a reference plane. And it does not follow (FLEX WITH) the 3d-face that it is formed from, too bad it does not. Is this standard Revit behavior? None of this is in the "Families Guide" from Adesk, that is for sure.

Oh my. I just noticed that this is the Structural Familes thread! Actually mean to be in the arch thread...

why? a sweep is a sweep and a sweep path is a sweep path. Doesn't matter Arch or Struc. I use RAC 2011 but always check this forum for interesting family threads...