select found_rows() returns always 0 if 2 members are up


i got Problems with our Wordpressblog and the Pagination function which uses a SQL Function: SELECT FOUND_ROWS(); This functions returns always 0 if both Clustermembers are up. It is no difference if the Statements are balanced to both Servers or only to one server - they will return 0 if they are both up. If I stop one of the members and the cluster_size is 1 the SQL Statement returns the correct numbers.

Any suggestions?