On Alexandria I've encountered particular problems with images loaded on AdvMetroButton.
a) loading Picture (Png,Jpg etc.) on designtime on a AdvMetrobutton raises an error due invalid graphic format
while using button.picture.loadfromfile on runtime works normally
b) metrobutton will painted often with wrong background different from his own parent-panel:
to reproduce just
create simple TForm with AdvMetrobutton on it. load some picture on it.
let recreate from this form a second instance of this form.
first instance displays fine, second instance has wrong background on metrobutton