I am laying out a PCB using EAGLE 7.7.0 for Linux (64 bit).
When I run the Autorouter (high effort) it runs 22 variants of the routing, and all 22 produce 100% complete routing.
Below the dialogue is the standard warning "Percentage may decrease after final processing of polygons". Sure enough, it does: many of the variants, upon selecting them, turn out not to be 100% routed - one or more connections cannot be routed because the polygon ground fills have split into two parts which cannot be connected.
Is there anything I can do to make EAGLE check whether they really are 100% routable, before I permanently select one? At the moment the best method I have is to undo the whole routing, recalculate them all, try the next, and so on.