I am creating this topic only because I did not find a solution on google.

the issue was that the console spat out "audio I/O stuck... closing audio" whenever i wanted to enable DSP. all this on windows 7

the solution was, however, trivial:

pd vanilla must be started with administrator priviledges
pd extended works either way

it was confusing, as one worked and the other didn't

thank you for your attention.

great forum.

the best.