Bug Action loses script after reopening form in designer

Hi All,I have a strange problem in a database on our Domino 8.5 Server.

After changing some script in an action button in a form the changes work properly.

But when I now reopen the form in designer the changes which i made only seconds ago are lost.

When I open the form in normal client the script, including my changes in this action-button works fine.

Does somebody in the whole world has the same problem or any clue?

I really have no idea.

I tried it on several clients as well as in different databases with the same form without any results.

The action button works fine in domino 7.0.2. Also some weeks on 8.5 and since 4 days i have this strange failure.

Thanks for your help.

Andi Kress