Been using the for years and am constantly annoyed that when I click the maximize window button Omnigraffle doesn’t. Am I missing something?
The green button does not mean “Maximize” on OS X.
Prior to Yosemite, it means “toggle between the best size for this document, and the last size I manually resized the window to.”
Since Yosemite, it means “go into fullscreen mode.” Hold down Option to get the old behavior.