Sedumi had numerical difficulty, so the “solution”, i.e., the values of CVX variables after execution, is not meaningful. SDPT3 basically declared the problem to be infeasible. I suspect that the values of M and K result in a numerically ill-behaved problem - this could potentially result in a false conclusion of infeasibility, as happened using SDPT3, even though a human observer can clearly see the problem is feasible. Perhaps your problem is inherently extremely ill-conditioned - maybe Omega is nearly singular? You ought to look at the span of magnitudes of elements of M and K, which could be a contributor, apart from ill-conditioning, to numerical difficulties.

It may be that there is s a more numerically stable reformulation, or if not, that you might need a quad precision or higher solver (not available under CVX). If you have the capability to use MOSEK or GUROBI under CVX, you could try them, as I think those solvers are more numerically robust than sedumi or SDPT3, and therefore can handle somewhat nastier problems before running into numerical difficulties they can’t handle.