Conflict : Altered WP_query

Hi,

I’ve been asked for a bug on my event post plugin.
See the thread here http://wordpress.org/support/topic/multi-site-event-post-widgets?replies=8.

After many searches, it appears that there is a conflict, when Paid Memberships Pro is activated, it alters the call to WP_query, so I found no way to remove this parameter :

[tax_query] => WP_Tax_Query Object
    (
    [queries] => Array
    (
    [0] => Array
    (
    [taxonomy] => category
    [terms] => Array
    (
    [0] => 1
    )

    [include_children] =>
    [field] => term_id
    [operator] => NOT IN
    )

    )

    [relation] => AND
    )

So it excludes every post within the first category of each blogs. Is there a way to deactivate this feature, even temporally ?

many thanks.

https://wordpress.org/plugins/paid-memberships-pro/