So I did some testing and discovered that the issue is related to information stored inside the active UPF file. I don't know what specific information is creating this attach loop. I added the test2.dgn file as a reference to the active file. When both the active file and referenced file have 3D "managed" models you get the attach loop issue. If you open the message center you can see this in action. Any civil command creates a repeat attachment of the 3D "managed" model. This accumulates very rapidly to hundreds of attachments. I replaced the active UPF (250 KB) with the stock untitled.upf (3 KB) and the issue has stopped. It's not entirely clear what gets written into the UPF. It may become bloated or corrupt over time especially when running concurrent instances of Microstation that access the same UPF. I think it would be good practice to occasionally replace the UPF with a fresh copy. This can be done automatically by placing a standard UPF on disk and pointing the config variable MS_USERPREFSEED to this file. You then delete your working UPF and Microstation will automatically create a new one using this UPF seed.
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