Master volume is not set as either the foreground or background

Hello everyone.
I am using the latest stable version of 3Dslicer and I came across a problem:
I want to open DICOM images as a single series and be able to view them consequently, however the software recognizes each of the images as a single series. I tried running patching to no avail. I would really appreciate if Some one could give me some pointers on what to do.
Thank you all very much