Surprisingly, I fixed this bug on Ubuntu 12.04 32 bit OS only. 
And I rechecked it, it is working fine on my machine.

I am trying to know what could be the problem for the shaking behavior.





On Tue, Aug 21, 2012 at 9:06 AM, Vaughan Johnson <vaughan@audacityteam.org> wrote:
On 8/20/2012 8:22 PM, Gale Andrews wrote:
>
> | From Vaughan Johnson <vaughan@audacityteam.org>
> | Mon, 20 Aug 2012 19:55:53 -0700
>> On 8/20/2012 7:04 PM, Gale (Audacity Team) wrote:
>>>  Vaughan wrote
>>>> My guess is that it needs to check at the top whether the t argument is
>>>> already visible before proceeding. If so, just return. That will
>>>> probably work for all platforms, but there's no current Track method
>>>> that will do that, afaik.
>>>>
>>>> [...]we should, after 2.0.2, do what I suggested in the previous
>>>> paragraph.
>>>
>>> No problem on Ubuntu 11.10 64-bit, but the problem persists in 12.04 even
>>> after reboot. Both machines use a Gnome fallback, not the Unity shell, but
>>> if that is relevant, a lot of Ubuntu users don't use Unity.
>>>
>>> The "shaking" affects dragging a stereo track on its own with no other
>>> tracks
>>> present. So it's quite serious IMO. I think it would warrant release noting
>>> it
>>> online, rather than putting it in README.
>>>
>>> Also we don't know if this may also be a problem on Mac. Unless someone
>>> chimes in that this is a fluke, I would be inclined to revert this until we
>>> can
>>> investigate it fully.
>>
>> Okay, reverted, r11942.
>
> Thanks.

:-)


>
>>>> [...] As this was P3 I'd have been interested in slipping this fix into
>>>> the README before the Mac Nightly, but it looks like there could
>>>> be a problem with it.
>>>>
>>>> I'll try it on Ubuntu 11.10 64-bit presently and let you know.
>>
>> Too close to the Mac nightly, so I've committed the reversion.
>
> Looks like I left too much of the past quote in, sorry, but as stated in
> the actual reply, it was OK in Ubuntu 11.10 64-bit for me.

Thanks.


>Doesn't
> change my view that it would have been a risk to leave it in.

Thanks. Glad I reverted it.

 - V

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