what a good advice (;
chris told me to try saving the patches on the phone instead of the sdcard.
this works now :: a folder in the root directory of the phone called PdDroidParty

also i post a message from mxa on GitHub:
AFAIK Android versions 4.1(?) and up only allow apps to read and save data from the SD-Card which are in their folders, which is SD-Card/Android/data/net.droidparty/ or similar

thanks to all

thanks for the reply.
but yes i tried with this path (even naming a folder sdcard)..!
see attached screenshot.
in the meanwhile i also tried on other phones with the same result.
is there any way to do a manual browsing to the folder?
or other kind of trouble shooting?
thanks
klaus

Screen Shot 2015-10-06 at 20.02.44.png

i found a few related posts on this forum, but none of the suggested solutions worked for me.
the problem seems to happen for others as well.

i have PdDroidParty running on my Galaxy A3, Android Version 5.0.2.
i put the test files from http://droidparty.net/ onto my sd card in a folder called
PdDroidParty but the app does not find any patches.
i only see a black screen with "PdDroidParty compatible patches found:"
"finding patches" is performed at startup but the screen stays empty.
i tried other locations for the pd-patches and naming the folder differently according to my web-searches with no success.
any help please?