3d: make some changes to loading to reduce (to zero?) the possibility of a race condition.
3d: make some changes to loading to reduce (to zero?) the possibility of a race condition.

DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc