now that I've reread the help files, please note that my problem as stated was that the HIGH option under REC Mode is not highlighted. Since, as stated, the number of megabytes to be dubbed does not exceed the number of megabytes available, the question is why the HIGH option is not available. Until I can answer this, I can't high speed dub multiple titles, no matter how many titles I have in the list.
Upthread you wrote you're using DVD-R. Deleting titles from DVD-R does not free up space. It only makes "deleted" titles unplayable. My Magnavoxes all gray out HIGH when not enough space is available. It seems to me you must be determining available space inconsistently with what your Phillips is doing.