Noticed this bug while playing the Super Grinder/Abandon/Containment (DG:TA).
Aliens are glitching thru the tower shields despite an open path being available.
Seems to occur most often while game is being fast-forwarded. http://youtu.be/AMKfmfxIPkM - Video 1 http://youtu.be/htOjS9zthhs - Video 2
This is a well known bug in DG and it occurs when the density of aliens in a single location gets high. This map & the location in the map is a particular problem. HPE never could solve this bug so gameplay around it.