I 2nd that, on GMSH 2.10.1 I am able to do 3D of orders 1,2,3 of the mesh Mr. 
Ravichandran has provided without any warnings.

Greetings,
Aleksejs

On 06.07.2016 10:16, Vincent Huber wrote:
> Dear Mr. Ravichandran,
>
> I am not able to reproduce your Warnings with gmsh 2.11 or 2.12.
> Which version do you have ?
>
> All the best,
>
> VH.
>
> 2016-07-05 21:53 GMT+02:00 Thej Kiran <[email protected] 
> <mailto:[email protected]>>:
>
>     Dear GMSH team,
>
>     Thank You for your free software. I am using this software for linux. 
> Recently I am trying to mesh a 3d structure with tetrahedron elements of 
> order 2. I am having 5000 elements which have negative jacobians! I am not 
> able to understand the gui options and the tools, as I cant find any help on 
> the gui options with the advanced tools any where. I checked it on your gmsh 
> documentation and couldn't find help on that.
>
>     I get warnings, but I do not know how to view the elements that have 
> these warnings!
>
>     At this point, i would appreciate any help you can give me. I have 
> attached the geo file. All you have to do is click '3D' and 'set order 2' and 
> watch the warning in the console. I tried guessing so many options! I even 
> tried the optimization, but then either it crashed or I didn't get what I 
> wanted! Please help me or point me to resources where I can determine how to 
> solve this issue!
>
>     Thank You. We should start a forum within Stack to get help and support 
> others!
>      
>     Regards,
>     Thej Kiran Ravichandran
>     2nd Year PME Master
>     TU Delft
>
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