Version:            (using KDE 4.3.1)
OS:                Linux
Installed from:    Fedora RPMs

How to reproduce:
1. Open dolphin
2. Open built-in terminal in dolphin.
2. Plug-in storage device
3. Mount it in dolphin
4. Try to unmount device in dolphin

It causes "device is busy" message. It's true, cause path is opened in built-in terminal, but it shouldn't work in this way.

Expected behaviour:
Unmount without problems, like when terminal is not opened.

Workaround:
Changing current path (in terminal or files list) before unmounting.

Problem occurs always if terminal was used in current session, even if it was closed. For me it looks, like Dolphin open terminal first time I want to use it, but instead of closing, only hide it.