This is not working here, nothing change, any other idea ?

EDIT: ok this fix works greatly however think to check that in fireboard > plugins > Recent Post Settings > Show Category you have all the needed forum ids present to be sure here is what i put in (adviced by Florut) :
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50