Cracks like the ones in the thread below? Unfortunately the crossbar cross-sectional shape creates a stress riser where the trampoline track is formed and leads to the crossbars cracking. Not sure why Hobie did it that way on the 17 as all of the other boats have a much better crossbar design. Anyway, on my boat I welded the cracks and then added a stainless strap to resist the torsional stress (shown in the the thread linked below). It seems to be holding up well for several years now.
https://www.hobie.com/forums/viewtopic.php?f=15&t=56858&p=297586&hilit=Crossbar#p297586sm