This bug is only related to a special case. I'll try to describe the case I encountered as best as can.By opening two AFNI control sets, it allows us to view images in one control set (A) while view the time series or HRF time course in the "Graph" of another control set (B). Interestingly, if we select the "Talairach view" in Control Set A, the timing graph in Control Set B can "warp on demand", i.e., spatial coordinates are automatically warped to the Talairach space though Control Set B is in original view. This is very useful since we don't need to transform all datasets to Talairach by this means. However, comparing multiple time series or HRF by using "Tran 1D Dataset#N" plugin in the Opt button of the timing graph is not functioning in this setup. When selecting the datasets for Input #1, #2..., the "choose dataset" button is greyed out. We simply hear a error beep. Sometimes (not always), the terminal window may also show an error message "xlib error..". There's a possible bypass for this. By switching Control Set A to the original vew, the "Tran 1D Dataset#N" is available. After adding the additional timing curves, we can switch Control Set A back to "Talairach view". This seems to be a bug. Fixing this makes the operations more straightforward.