Undo bug, mouse pointer disappears?

Question

Is just me or everyone has that annoying "undo" bug?
That's what happens: when I press UNDO speedgrade starts to behave strangely.
- If I press undo after clicking right mouse button (and I'm moving a color wheel with mouse) comes out a message "optimizing timeline" and timeline thumbnails are shown under the timeline. Sometimes there is a worst scenario: mouse pointer disappears and I have to quit SG and reopen to get my pointer back.
- Pressing ctrl-z without right mouse button clicked (outside wheel edit mode, or whatever it is called..) sometimes works, sometimes appears the annoying progress bar "optimizing timeline" and several steps of undo are taken, even if I pressed cmd+z just one time.
I use undo A LOT, and now I'm not confident using it because of this strange behavior (I'm on osx).
Are you experiencing the same problems?

Answer 1

You won't believe this but just cleaning a mouse can improve performance... read the following:
How to Clean a Mechanical Mouse
This article explains when and how you should clean a mechanical mouse. It does not apply to the the Apple Pro Mouse.
You should clean a mouse if it is does not track smoothly, or if it jumps or skips. A mouse contains a small ball that must roll smoothly for the mouse to work properly. You should keep this ball free of dirt and oil by using the mouse on a clean, lint-free surface, and cleaning it occasionally.
Use the following procedure to clean a mouse:
1. Turn off your computer.
2. Turn the mouse upside down and rotate the plastic ring on the bottom counterclockwise to release it.
3. Turn the mouse right side up with one hand and catch the ring and ball with your other hand.
4. Clean the three small rollers inside the mouse with a cotton swab moistened with water. Rotate the rollers to clean all around them. If there is a build-up of material on the rollers that the cotton swab does not remove, you can use your fingernail to gently remove the material.
5. Wash the mouse ball in soapy, warm water with a mild soap such as a dishwashing liquid if oil from your hands has collected on it. Be sure to dry the mouse ball thoroughly.
6. Gently blow into the mouse case to remove any accumulated dust.
7. Put the mouse ball back in the mouse case and replace the retaining ring.
If cleaning the mouse as described does not correct your issue, the mouse may need to be replaced. Have an Apple Authorized Service Provider check it for excessive wear or other failure.
If that doesn't do the trick, if this is a mouse that required 3rd party drivers, you might try reinstalling the drivers. Also, try going back to default Mouse preferences on all Users, see if makes a difference.
Carolyn