This is a common bug and has been reported multiple times before.... Sadly I do not know what is causing it.
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try to upload the game showing all the variables (stop, start, stop,upload)
, then after the user click the flag hide them, doing that way you will be able to show them again.
i had this problem when uploading the game in the middle of the testing. so the variables were not visibles, so i stop the game at one point where thy are visibles, the upload that way and it works.
hope this helps.
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It's an annoying problem but all you have to do is make all the variables show when you upload the project, and then put in a script to hide the ones you don't want showing when the green flag is clicked.
It can be quite annoying because it can look bad if there are a lot of variables on the screen at the start and you need to hide them.
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