Dropbox panel indicator disappears when laptop lid closes and reopens

[torreydale]

I don't know why yours is happening so often.  For me, I may lose an indicator if I suspend by closing my laptop lid or if I hibernate the pc.  Both of those actions tend to give me some swapping.  Manually suspending the laptop does not.

My best guest for what the refresh button is doing is it's rebooting the panel in Xfce.