I'm not sure if this is just me, but I am getting a bug when I maximize the program (Win10). Tried unistalling and reinstalling, and changing 32 and 64 bit, but no fix. Making it difficult to switch which screen I have it on. Do enjoy the software though!
This is a known issue that will be gone once Qt 5.6.1 is released and Tiled is compiled against that version. In the meantime, it usually helps to close the Maps view while doing the resize, since the crash is related to the rendering of the file icons.