“I have ceramic tiles on my floors and I actually had grout cracks in some of the floor areas.  We filled in the grout and in a few weeks, the grout cracked again.  Will the IBS 2000 help eliminate any future grout cracks?” 

Two things that you must look at: 1) are the joists deflecting or sagging a lot and 2) is there excessive vibration or bounce in the joists.  If you find that the joists are deflecting too much, then you must first lift or jack up the joists.  Then you can install the IBS 2000 bridging.  Luxor recommends that you use retrofit IBS units.  The IBS 2000 will structurally lock the joists together, stiffening up the floor system.  This will minimize joist movement. 

Please note that grout crack could have been caused by poor installation ( tile/mortar bed or floor system ), inadequate design ( was a wider o/c spacing used or a heavier dead load ) or subfloor issues ( excessive deflection of subfloor between joists ).