It's repeatable for me. Here are the steps:

Start with empty workspace

Create new blank topic

Add a few subdocuments

Highlight parent document

Click on Tags attribute in the Task Pane

Type in tag value - in my case, the tag value is MFC

Highlight tag value with mouse, right click, select Copy ...

When I try to paste a word into the Tags attribute, I get an Access Violation. Instead of the Tag word being entered, a folder is created with the name of the Tag.

Is this a known issue? I'm setting up a database, and I'd like to be able to paste into the Tags section.

I'm using a trial of 4.02 ...