Hello! When I've pressed f11 once and finished what I was doing, I press f11 to get out of fullscreen. This takes me to a minimised version of Minecraft, and I am unable ot maximise the screen.
Environment
Windows 8.1 with latest version of the Minecraft launcher and using Minecraft 1.8.8.
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-68754. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.