I’ve found several annoying toolbar problems in Designer, as follows:
Between sessions, it always forgets which toolbars were previously open. E.g. if I open Designer, right-click the toolbar and choose to display “Universal”, then close and reopen Designer, the Universal toolbar will not appear; Designer has reverted to the default toolbars.
Intermittently, switching windoes in Designer causes toolbars to close. E.g. if the Universal toolbar is open and I currently have focus on the Agents list, then I open a single agent, the Universal toolbar may close.
Various toolbar buttons are disabled (i.e. greyed out / unusable) in situations when they should be enabled. E.g. “Debug LotusScript” is always a valid function, and it is always usable in the Tools menu. However, if I have a “Debug LotusScript” toolbar icon in Designer, the icon is disabled when the focus is on the Designer homepage, or on any list of design elements, or an any of various panels. The only situation in which that icon appears usable (that I’ve found) is when the focus is on a single open design element. The same applies to several other icons, including “Document Properties”, “Database Properties”, and “Access Control List” (all of which I added to the Universal toolbar because I want them always visible).