I have to say this that I am getting nuts when I want to turn off a level, whether it is in View Display or Level Manager, it starts selecting all other levels! You click on one level and MicroStation/AECOsim decides to select all other levels too.
And NO it has nothing to do with my file or configuration so please don't ask for the file or configuration. Out-of-the-box MicroStation/AECOsim behaves the same and Bentley may try it on every version they want to (MS=SS3 and ABD = SS4 - SS6). Tip for Bentley when trouble shooting, don't open the program and turn off levels because it works fine when you just started the software, it starts behaving weird when you are working for a while.
This sounds like an intermittent problem that we saw with a couple of users a year or so ago. The intermittent nature of the problem made it difficult to troubleshoot.
Regards
Marc
regards / Thomas Voghera