Fidap memory problem?

Fred

When I use Fidap on particulary strong cases (such as 3d or 2d thermofluidodynamic simulations) the fisolv runs for about 60-70 iterations, then he stops all activities (without reporting a convergence o a divergence to be happened, he reports no message) and when i try to start fipost, to see the solution he has reached in this few iterations, fidap shows an error message, saying then only mesh plot is possible. Could anyone help me in this strange problem? (is it a problem of memory? my system has 1 Gb for Ram and more than 1 Gb of HD, and it's a Pentiun II).