Also, there a work around. Please check the thread below:
Text, Image Saver permission issue
Check last comment by Salvatore Castro
Also, a note by Arnaud LIOTTA
make sure that the Service user of Netweaver has access to the folder
Hope it works out for you. It's been a long, once i get a chance will work this out for 14.0 and let you know, meanwhile please use above options.
Thanks,
Swaroop