Problem with opening/saving files in Pages/Numbers/Keynote

Hello, First of all: sorry for my bad english.

I had this problem already several months ago and already contact with the Apple hotline.

The only thing that was said then and was helped "new user account" - well done.

But:

I can not do this every 3 months.

The problem: I can not open a Pages / Numbers / Keynote files anymore.

From iCloud / iCloud Drive it goes, locally stored open still.

I'll get the error: "File can not be opened."

Newly created files I can not save - no matter which hard disk - it will show "missing access rights"

Of course, I've already deleted preferences, reset NV-RAM and repaired permissions (access rights) - via terminal "reset password" also.

Anyone here knows this problem and knows a solution?

Thanks in advance.

configuration:

MacPro (2009)

2x2,93 GHz

24 GB RAM

SSD + HDD

OS 10.10.2