Problem with creating timetables in editor

1. Which version of OMSI 1 or OMSI 2 is being used?

2.3.004

2. How often does the problem occur and how? (Error message, but playable / Crash / Freeze / ...)

always

3. Which action leads to the problem? (Place a new bus / Driving on schedule / ...)

crearing schedule

4. Which content was used? (Map, busses, ...)

5. Which mods or plugins were used? (SweetFX, ...)

6. Logfile in spoiler or attached

i have a screenshot

7. System information (OS, RAM, CPU, ...) more then recommended

When i create a timetable it seems to be like a gray layer on top, so i cant see or drive the timetable (look at screenshot)

Screenshot: https://imgur.com/r7IOVKr