>When working in my code i can chose search or replace (strg -F or strg- H) from the edit menu.(mouseclick or entering strg-f)
>I expect the popup of the dialog window where i can enter what i'm searching for and wether i want to search only within the the actual object or within all objects, case sensitif ...
>The expected dialog window is not shown,just a short flicker, no error messages.
>After this only insert and mark all(strg-A,strg-A) are enabled in the edit menu, all other options are disabled. When clicking in my code all options of the edit menu are enabled again.

I don't know if this could help you, but, for a while, I was launching all my projects from a small shortcut menus. So, the project was appearing, the one I selected. Then, I was able to enter in a form to design it and so on. But, whenever I was selecting the search option, for example, it went away. Later on, I've been advised to add NO WAIT in my MODIFY PROJECT line from my shortcut menu. That solved it.