Bentley Driver trying to output a DGN instead of a PDF.

I'm using Microstation V8i ss3 and when printing to pdf with the Bentley Driver it attempts to create a dgn instead. It will result in an error and fail to output if the file name is not changed (file already exists). Most of the time the print output is a pdf as expected. It creates only creates dgn file occasionally. If the file name is unique and it creates a dgn and I delete that dgn, then often the next try will result in a pdf. Otherwise I have to rename the output file.

Any help would be appreciated.