Slice viewer

Hi everyone
I have a question regarding the slice viewer.
I performed paired T test from the rest toolbox on a group with 6 subjects for 2 conditions.
When I overley it with the template (ch2), it keep giving me an error when I was trying to change the threshold scale provided in the viewer.
I have the latest version of REST.

Any Ideas please?
Nahla

 That sounds strange. Could you copy the error here? Any error if you set the P value directly?