Your system information

• Steam client version: Latest as of today
• Distribution (e.g. Ubuntu): Ubuntu gnome 16.10
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

In a friends profile if I click on offer a trade, a new window appears (as it should) but
after that any other window from steam isn't possible to use until the trade window
is closed, not even the chat works.

Steps for reproducing this issue:

1. Go to a friends profile
2. Click offer a trade
3. It should be possible to interactively use the other windows with the new one, but it isn't.