OH2 doesn't refresh config files

since a few days openhab2 doesn’t refresh on changed items- or rules-files. Before I could see that changed files have been read (openhab.log). Now this feature disappeared. I’m not aware of any change which have could caused this. No update, no change on a cfg-file.
The only things I changed were items and rules, nothing else.
What happened. How can I get this feature back?
I’m using openhab 2.0.0.