Independently of the PlugIn sequence in 1.7.4, I also get the mentioned: Form is missing __token or __ts fields error. Please, upgrade the plugin for the 1.7.x !!

@Phillip

I have a partial fix for 1.7.x:

In groupsfrommembers/views/default/forms/groups/invite.php, add the following line before line 33 (which starts with "if (($members = get_entities"):

echo elgg_view('input/securitytoken');

This will fix the problem with the member picker, but not the search.  I still need to look at the search.  To make sure you are always using the member picker, go to the groupsfrommembers settings and set it to a number that is larger than your maximum number of users.  If I get a chance, I will look at a fix for the search function.

@Philip

There is also an additional change that adds a link to the group invitations page to the email that is sent in groupsfrommembers/actions/invite.php.  The changes are too complex to describe here.  I will email you the file if you would like it.  Just let me know.