Simulator on Windows machine has gone crazy

A couple of weeks ago I pulled down daily build 784. After I installed it, I opened one of my apps that had a TAB BAR at the bottom. This app had worked fine with daily build 767, but with 784 the images on the tab bar were shoved down in the lower right corner of the screen.
I uninstalled Corona and re-installed an earlier version, and the problem is still there.
I switched over to my MAC and opened the exact same file (across the network) on build 799, and it looks fine. Also tried it on other builds on the MAC and they all look fine as well.

Simple solution is to just work on the MAC, but I would like to know what is going on.

Is there a known problem with the simulator on WINDOWS machines?

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