Main Tool Box disappears every time MS is closed. After reopening the program, I have to go to FILE/SETTINGS/TOOL BOXES/select MAIN. The tool box reopens right where it was docked before and with the same settings. It just disappears when the program is closed. Save settings has no impact. All the other tool boxes stay in place.
When posting your questions to the MicroStation Forum you should always remember to supply details of the software and version you're using. This can make a major difference to the answers provided. If you follow the MicroStation Forum Best Practices it would make this process quite helpful.
MaryB is correct in highlighting that this issue is most likely related to the operation of your User Preference File. The first thing to check is whether you have full Read&Write permissions to the folder where this is being stored. The following Wiki article may assist in understanding some of the other issues relating to UPF's.
https://communities.bentley.com/products/microstation/w/microstation__wiki/13452/troubleshooting-user-preferences-issues
RegardsAndrew BellTechnical SupportBentley Systems