The Barrier Crossover box on the Linear Solver tab:

bcross

is used to control whether or not the barrier solver performs a crossover operation.  Unlike simplex algorithms, the barrier solver does not automatically find basic (cornerpoint) solutions.  Very roughly speaking, basic solutions have the nice mathematical property that exactly m variables will have nonzero values, where m is the number of constraints.  The crossover procedure takes the barrier’s non-basic solution, and, through the use of a simplex solver, converts the non-basic solution to a basic one.  If the basic solution property is not important for your models, then you may wish to disable crossovers to improve performance when using the barrier solver.

Note:Barrier crossover must be enabled if you plan to do range analysis.  Range computations cannot be performed if the final solution is not a basic solution.

The default is to perform crossovers.