Ajax error while fetching relation nodes

Hello All,

I have a relation select field which allows the endpoint node to be selected via the relation select view (node). The view is paginated : first page always shows correctly, but others generate ajax error:

Une erreur HTTP AJAX s'est produite.
Code de statut HTTP : 200
Informations de débogage ci-dessous.
Chemin : /?q=views/ajax&render=overlay
StatusText: parsererror
ResponseText : @import url("http://equidome.dyndns.org/modules/system/system.base.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/system/system.menus.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/system/system.messages.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/system/system.theme.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/overlay/overlay-child.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/contextual/contextual.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/calendar/css/calendar_multi...");
@import url("http://equidome.dyndns.org/modules/comment/comment.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/date/date_api/date.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/date/date_popup/themes/date...");
@import url("http://equidome.dyndns.org/sites/all/modules/date/date_repeat_field/date...");
@import url("http://equidome.dyndns.org/modules/field/theme/field.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/google_analytics_reports/go...");
@import url("http://equidome.dyndns.org/modules/node/node.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/search/search.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/simpleads/simpleads.css?mjo9nb");
@import url("http://equidome.dyndns.org/modules/user/user.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/user_alert/css/user-alert.c...");
@import url("http://equidome.dyndns.org/modules/forum/forum.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/views/css/views.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/chatroom/chatroom.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/ctools/css/ctools.css?mjo9nb");
@import url("http://equidome.dyndns.org/sites/all/modules/panels/css/panels.css?mjo9nb");
@import url("http://equidome.dyndns.org/themes/seven/reset.css?mjo9nb");
@import url("http://equidome.dyndns.org/themes/seven/style.css?mjo9nb");

Does anyone knows what could be the reason for that error ?

Thx