Strange things happen to my app, as well. On the live front page I’m missing tens of elements (groups, texts etc) after I pushed an update half an hour ago.
If I revert to a version saved yesterday, everything looks good but, as soon as I push a new update from the Dev mode, my live app is basically unusable.
It should be fixed now. This is the advice from support (after sending the bug report):
" Our engineers have gone ahead and pushed a fix for this behavior!(thanks to your quick report) There will be one more step to have this fully resolved and that will be to Deploy your app to live one more time if the live version is still in a bad state. If you’ve already restored your live version to the proper state then no further action should be required."