have been relying on FastStone Capture 5.3 for many years but it started having compatible issues from windows 7 onwards. when it completely failed, have switched to using windows’ built-in snipping tool for a while. but the annotation part is troublesome.
found a great alternative this morning: greenshot.
it has all the functions of FastStone Capture, including upload to Dropbox support. and best part, it’s free, but we could always support the developer with a dollar or two if we like/can (: