well, I just finished a cake for tomorrow, It looks good but I was reading you're not suposed to use cake mix for topsy turvy cakes!!!  and I did :'( chocolate pillsbury cake mix to be precise. no filling though, (customer didn't want none)

does this mean that my cake is going to collapse either tonight or tomorrow (because I used cake mix?)

I hope not :*(

any thoughts?

If you have a proper support system, the upper tiers are resting  on the straws/dowels/supports and not on the cake, and it should be fine.  

I hope so! I did used those wilton straws for support . fingers crossed and thanks for taking the time to reply.

It's going to be all about your supports at this point. As an added precaution I would keep the room in which the cake is kept really cool, so the BC stays firm and doesn't even think of budging or sliding and taking cake along with it.

I use cake mix all the time.  That makes no difference whatsoever.  It is completely dependent upon your structural support.  Cake tiers on cake boards or plates, resting on dowels inserted in the tier below it.  

cute cake--i love the happy jaunty crown on top

really nice decor