Hope I'm posting this in the right place. This is driving me nuts.
I had several images open and was busy scaling and exporting them one by one. Everything was going fine, until on the 3rd image I clicked File/Export and no dialog appeared. Tried Export To, nothing. Tried Ctrl+E and Ctrl+Shift+E and nothing. I tried rebooting, no change. I tried reinstalling (including GTK+), no change.
When I click Export, the main window loses focus but nothing comes up. If I then click anywhere GIMP just continues normally, as if I never even opened the menu.
I'm using GIMP 2.8 on Windows 7 Pro SP1 64bit.