Thanks for the great work on this module. I came across this other issue: Add widget for filtering group content by group audience in Views and I have some suggested improvements:

1. Improve the documentation. It wasn't clear how this works with OG 7.2 (as opposed to 7.1) but I finally figured it out. How to do it:

The user has to go to the content type that is set to be group content. And then edit the Group Audience field in order to check the checkbox: "Enable Render Views filters as select list" in the field settings. Then on the View add a Group Audience filter. Optionally the user can expose the filter.

2. Allow for a choice of autocomplete as well as select list in the filter. Allowing the option of autocomplete should help with performance if there are many items. Would require the choice when adding the filter, similar to how the option is given when adding a taxonomy term filter. It may also require rewording the checkbox on the field to something like "Enable Views filters as select list or autocomplete".

3. Allow filtering by Group audience label and id. Get rid of the "Enable Render Views filters as select list" checkbox and instead just add one more view filter "Group Audience label" in addition to the filter by Group Audience Id. I'm not sure why it has to be either/or - why not make both filters (label or id) available all the time? Nor is it clear why this UI has to be on the content type when it is only affecting the way a View functions. If both options are available then we don't really need the checkbox on the content type field.

#3 is a bit more radical but wouldn't force users to update their Views (I assume) since it could default to the dropdown.