Since the latest update, cortical activation with MIP:functional on does not show the activation properly. The activation map seems to be fixed even though we are scrolling the MRI. Please see the attached screen capture to understand better what I mean here.
This is the expected behaviour when using MIP: functional (Maximum Intensity Projection), what it is obtained is the maximal intensity across the 3 dimensions (axial in your case). To see the activation on the current slices, uncheck MIP: functional (right-click on the Figure > MRI display).