EU controllers have been somewhat sceptical of the Schengen/non-Schengen flexigates, and there were a few incidents where the wrong doors were opened so that passengers who should have gone through the border control did not.
Pengendali Uni Eropa kadangkala meragukan sistem gerbang fleksibel Schengen/non-Schengen, dan terdapat beberapa insiden dinama pintu yang salah dibuka sehingga penumpang yang seharusnya melewati kontrol perbatasan tidak melewatinya.