Many function in Vecci do not work with "still possible - but really bad" vectorlists. What makes a vectorlist only "still possible - but really bad"?
if there are many or all vectors "individual" vectors, that are not connected to any other vectors
if the vectorlist is perfect or good and contains very many vectors (e.g. >50)
all vectors have a length smaller than 127/128 (depending on the sign)
These vectors can only be exported to "synced" list (not if good or perfect - these lists just look bad on a real vectrex).
The sync list generated is a real performance "hog", since it will sync after each such vector.
Try to avoid these kind of vectorlists at all cost!