problem with ext. sd since kitkat update

Hi,
since the update to kitkat reading/writing from/to ext. sd doesnt work.
Sometimes the r/w attempts even lead to app crash.
Due to some infos the reason is a change of the permissioning concept/functionality which was not or bad communicated by google.
Is the issue already known ?
Thanks for your attention.
since the update to kitkat reading/writing from/to ext. sd doesnt work.
Sometimes the r/w attempts even lead to app crash.
Due to some infos the reason is a change of the permissioning concept/functionality which was not or bad communicated by google.
Is the issue already known ?
Thanks for your attention.