Can add listbox control to userform, but cannot delete!

I am very confused about this. I am building a new userform and I need to add/modify listboxes. Once I add one then the weirdest thing happens... I can't delete it.

It gives me this error when I try to delete it: "Could not delete the controls. Unspecified error."

Then it won't let me save the file and when I try to close the excel file it gives me another error: "System Error &H80004005 (-2147467259). Unspecified error"

This only happens for ListBoxes, not the other controls... Why is this happening?! The file is attached, please help.

There aren't any on there. On my computer I can add them, but then I can't delete them.

I just downloaded the file that I posted and it seems to be working fine. I'm thinking it might have something to do with the file location or something... I'll just mark this as solved.