Just popping in to let you know we're aware of a number of issues that can be caused by moving build orders, the tricky part is finding out why (from my own experience the behaviour doesn't seem to be very consistent). Thanks for the heads up though :)
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Now that I had to move stuff around I noticed that it sometimes means the thing you're moving won't be saved and will be lost if you don't copy it somewhere that can be saved (aka doing a purchase order or even a whole build again, only to have to move it and risk losing it anyways).
I'm guessing it has to do with the server lagging when I do the moving, but I couldn't find a pattern. I post this because I just lost a whole build I moved, which was basically a summary of the whole guide. I saved it multiple times and tried to preview it, moving it in between previews to see if it changed anything. As I moved along the guide trying to fix this I encountered another bug, which shows every purchase order in a whole build as the purchase order you last viewed in that build, and as I didn't want to risk losing even more I closed without saving, hoping that at least the build will be there even if it didn't show in the preview. As I'm writing this it obviously didn't happen, and next time I checked the guide I didn't have the build.