Two issues to report. I hope I'm not annoying you with repeats of old issues, but I've not seen these particular things mentioned before:
I'm using Windows 7, screen resolution 1024x768, and when I run in maximized mode, the timeline toolbar is not sized properly to fit my screen. I can only see the full span if I use windowed mode or undock the toolbar. This incorrect sizing makes it impossible to adjust the length of my animation when in maximized mode (I can click the current time 'maximum frame' button to change the length, but I can't get the edit text field). As far as I've noticed, this only happens with the animation timeline bar.
Also, I've noticed something wrong with the copy/paste keyframes functionality. If you have nonlinear speed curves on any of your keyframes and use copy/paste, the speed curves of the pasted frame and all frames past that point may be messed up. What seems to be happening is that speed curve information isn't being saved with the copy function, so when it's pasted it just overwrites the next value in the list. And that sets all later speed curves back one frame as well.
To clarify, it's like this
Before copy/paste
Key 1 - linear
Key 2 - instant
Key 3 - linear
Key 4 - linear
Key 5 - bezier
Key 6 - instant
After copy/paste
Key 1 - linear
Key 2 - instant
Key 3 - linear
Key 2 copy - linear
Key 4 - bezier
Key 5 - instant
Key 6 - linear
Update: Upon closer inspection, this effect seems to occur when a keyframe is added for any reason, and not just copy/pasted frames. Also, the undo command does not appear to fix the curves involved.