Can't delete master 1?

I just upgraded our iPC to v3.0.4 using the xPE image.

When I try to remove a cuelist from master1 that has been played at some point (holding choose, pressing delete), it does not remove the list and the title of the cuelist becomes highlighted blue. I can't find anyway to remove it other than logging out and logging back in. When I log back in, the show comes up with it removed. At this point I can move a cuelist back onto it or off of it at will, but as soon as that cuelist is played it won't let me remove it (even if the cuelist has been released). This only happens on master one, all the others are working normally.

This is new behavior to me, could it be a feature of some sort or is it a bug / corrupt file?

thanks.
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