Hi,

   I am sorry to hear of the problem, but I think I know what happened.

   In every PDF, there is a paper orientation value (Portrait or Landscape) and there is a view rotation (0 deg, 90 deg, etc.).

I suspect that what could have happened, is that you had one file in landscape mode with the viewing angle set to 0 deg and that you were merging that file with another which had the base orientation set to be in  Portrait mode, and that the viewing angle was set to be 90 deg so it would appear in Landscape mode.

   In terms of a fix: I will be introducing a "rotate page" feature as part of the next upgrade to PDF reDirect. In the mean time, you can select "Print" from the PDF Reader so that the PDF appears as a Printer Output file in the Merge List. For each file in the Merge List (or as a group), you can change the page rotation in the Upper RH side of the program in the Printer Output Settings area to set what you need.

   I hope that makes sense, and helps resolve the problem.