This problem (+ another problem that I did not describe) has been  
solved in alpha.sagenb.org.
Verified with both Safari and Firefox browsers.

Thanks for your efforts!
Jim Clark

On Oct 22, 2009, at 7:58 PM, William Stein wrote:

> On Thu, Oct 22, 2009 at 1:48 PM, Jim Clark  
> <jimfortheea...@earthlink.net> wrote:
>>
>> Here's another case that was working in the tinyMCE cell in Sage 4.0,
>> produces the error "Couldn't find \end for begin{cases}" in Sage  
>> 4.1.2,
>> but works in a normal (html) cell:
>>
>> %html
>> For the potential defined by:$$ V(x) = \begin{cases}
>>
>> 0 & 0 \leq x \leq a\cr
>>
>> \infty & x<0, x > a
>>
>> \end{cases}$$
>>
>> the stationary state solutions are $\psi_n(x) = \sqrt{\frac{2}{a}} 
>> \sin
>> {\frac{n \pi x}{a}}$.
>
> Hello,
>
> Thanks for reporting this.  It is now fixed in the new alpha version
> of the notebook (which will be released soon).
>
> By the way, I've setup
>
>     http://alpha.sagenb.org/
>
> with the new notebook server, so you can confirm that the problem  
> is fixed.
>
> You might want to test http://alpha.sagenb.org/.  In particular, try
> opening the same page in two different browser, and see whether you
> get massive corruption or not.


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