In just about every piece of software I have ever used there has been some moment where a different variation of keystrokes or hotkeys has given time saving results that I could have used earlier.
With flash it was Control + Alt + Enter. I am so used to using Control + Enter to test a movie, but Control + Alt + Enter allows you to test a movieclip. As soon as I used it, I wish I had been using it 6 years earlier. DOH!
I don't know what else to call these frustrating moments so we'll just call them "Frustrating Lightbulb Moments".
I had one today... in Photoshop none-the-less. Which is REALLY frustrating because I've been using it longer than any other software in my quiver.
Using the brush or eraser:
Shift + LMB + (pull your mouse from left to right, top to bottom, 45 degree angle) is not the same as LMB click THEN Shift + Click. Now I have to say goodbye, if only for a while, to the line tool.
Line tool: Hey buddy, You wanna get some work done?
Me: ummm. Sorry but I've got a different matte painting I'm working on where I'm not gonna need you.
Line tool: Wha? What's the painting?
Me: It's a 1700's style harbor.
Line tool: Hey, i would be very helpful for that. All those posts and beams and straight lines type stuff?!
Me: ummm... I've found another tool.
Line tool: wha? huh? eh? ... What tool?
Me: The brush.
Line tool: Huh? You've known brush for ages. He can't do what I can!
Me: uh. yeah he can. I can draw straight lines in whatever direction I want.
Line tool: %#*@!
Me: Hey, it's ok. We'll get together again sometime soon... I promise. We'll play the Xbox or the Wii sometime soon, Ok?
Line tool: *sniffles* Ok.