Just wanted to clarify what Stev has pointed out.
NBU 7.6.0.2 (using VDDK 5.5) and 7.6.0.3 (using VDDK 5.5 U1) are compatible with vSphere 5.5 U2, according to the N+1, N-2 reference in the VMware documentation Stev linked to above; however our supp...