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But I managed to do this with Windows 7 like a year ago... I had no problems at all :I

Then making a story is way too, well not hard but, annoying to switch between Dev Mode and regular game mode.

Within that time, something could have happened to your Windows 7 installation (like a complete reinstall or simply switching computers) that made this issue effect you. Not every Windows user is affected by this (and it is likely to be those who use Windows Vista or 7). You should still be able to access the debug menu from a non-development profile, though.

I am not effected by this issue (though i run Windows 7, too), which makes it very difficult to figure out the reason why it doesn't work, hence i have not been able to find a solution. Anything, therefore, i offer as a potential solution would be based off of speculation.