Alpha3 doesn't work with Drupal 7.0 release

I've got the same problem.

*edit*

Well it works, I unpacked the feature and uploaded it as a module and worked.

http://drupal.org/node/953236

I've got the same trouble but found UI at /admin/structure/features/create.
There is no any menu items or links anywhere. Just clean Features menu. Possible that's why it's called Alpha 3. :)

Its fixed in commit #441278. http://drupal.org/cvs?commit=441278

Actually, it's not the working patch. It doesn't work with this line:
$form = $form + array('packages' => array('#type' => 'vertical_tabs'));

Actually, it's not the working patch. It doesn't work with this line:
$form = $form + array('packages' => array('#type' => 'vertical_tabs'));

Try with this patch http://drupal.org/cvs?commit=441288

The following patch fixes the problem.

Mukhsim.

I initially found that the patch in #7 did fix my issue for alpha3. However, I went to roll the patch against 7.x-1.x-dev and found that the issue has already been corrected there, using a different fix:
On line 461 of features.admin.inc:

  // As of 7.0 beta 2 it matters where the "vertical_tabs" element lives on the
  // the array. We add it late, but at the beginning of the array because that
  // keeps us away from trouble.
  $form = array('packages' => array('#type' => 'vertical_tabs')) + $form;

So I tested dev, and sure enough, that works too. So, if you have the problem, and can't run anything more recent than alpha3, then use the patch from #7. Any dev snapshot from at least today onward as well as any other releases after alpha3 will include this fix.

I'm going to save the maintainers the trouble and mark this fixed -- I hope I'm not overstepping bounds. Feel free to reopen if needed.

This will be a non-issue with the next release (that's about to happen).