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If user sets as default an object into the Data group Editor this one doesn't appears as default into the placement tool view, the system always remember the latest item used.
Default catalog only applies when you have no "Most Recently Used" (MRU) in the user preferences. In order to see default, you must have delete your current user preferences. C:\Users\<username>\AppData\Local\Bentley\AECOsimBuildingDesigner\10.0.0
The feature is only intended to change what a user sees the first time they use a tool, not every time they use the tool. Once they start using the tool, the tools will show the last-used catalog item.