how about a force sync/refresh button?

Your problems steam from that your full of opinions that you believe are fact, yet are not. 3 in your last post alone.
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"Maybe 99,999,999 other users just haven't questioned it yet."
No, I think it would be pretty obvious to us all if every one else was having your problem.
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"But you seem intent on believing that dropbox is completely bugfree."
No, I never said that, I explained how DB gets its update alerts on changing files, and how InDesigns Open File Dialog will also, both from the OS both you are reporting are not working, conclusion OS faulting in not reporting to all applications requesting said info.
This in no way implies DB is bug free, so I assume that you just boasted that out to attempt to mitigate my conclusion that your OS is not supplying info to apps as expected of it.

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"Do you work for drop box? because the way you are writing indicates that you do. and frankly your professionalism is pretty poor."
No, and the way I write indicates anything BUT that I work for them, you state a lack of professionalism and yet you say I write in such a way as to imply I work for them, the two statements conflict on the assumption of employment with DB IMHO.
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Now to explain why I pointed out the above misconceptions by yourself. If you wont consider anything but the idea that you are correct from the start and that it can only be what you think is wrong, even in the face of explanations of cause, your destined to just have a non functioning app, non functioning for the same reason a car wont run without petrol, nothings is wrong with it, it just needs something to make it work, which isnt being supplied. Sitting in the car and telling everyone its the car company who should fix, that the car doesnt go when it doesnt get petrol, and that they should make a handle that each time you turn it the car goes for that second, wont get anyones attention at the car company, and wont impress the other car owners in having this pointless handle.