DWS saves button info incorrectly?

[Mipmap]

I'm still having trouble like that in my two recently posted threads. However looking closer at it, this time I tried fixing the buttons, saving then closing DWS and reopening my project.

When I reopened my project after having just linked the buttons, I found that some of the buttons had their links cleared when I saved. What used to link to a new menu screen was now completely blank. Now, this never happened at all when I first made the menu for my first disc, and edited it to reuse on my second.

Is there a known bug where going back to edit a button's link will cause the program to save it with no link at all?