On 2016-08-31 04:25, Eric S Fraga wrote:
> On Tuesday, 30 Aug 2016 at 18:12, jsj wrote:
> 
> [...]
> 
>> | a     | b | c |
>> |-------+---+---|
>> | α β |   |   |
>>
>> Is it just me or you can reproduce the same behavior?
> 
> I have seen the same at times.  Not always so it may be font
> related.  Not sure.

I'm not sure I understand the problem description. Turning on prettification does breaks table alignment; thus, 

| a      | b | c |
|--------+---+---|
| \alpha |   |   |

is always displayed as 

| a      | b | c |
|--------+---+---|
| α |   |   |

I can indeed reproduce this; one way to prevent it from happening would be to prettify "\alpha" as "α     ".

On the other hand, realigning the table (by pressing tab in a cell) produces the expected alignment:

| a | b | c |
|---+---+---|
| α |   |   |

which in turn looks wrong when prettification is disabled:

| a | b | c |
|---+---+---|
| \alpha |   |   |

Does this match your experience? If so, I don't think it's a bug, as much as a limitation of prettification.

Clément.