I have found this too. You can add as many of the same/different modifiers (when multiple selection is enabled), but you can not remove any if selected by accident without cancelling the original item and re-adding.
Sorry, looks like I was talking about a different issue to Edgar. I was referring to entering items in a new ticket - you can not delete a modifier. This is not a big issue to me.
Two small issues I have found today.
1. When you are editing a Menu and click
Edit All Categories, the
Numerator Type is in Turkish.
2. If you remove
Header text from
Edit Product Properties (when using only product pictures), then
Edit Category Products shows blank selected products.