This has only started happening to me as of 4.3. During normal usage the editor will suddenly refuse to open menus (either from the top menu bar, dropdown boxes, or right clicks). They’ll sometimes appear on screen and instantly disappear. This seems to only affect a single project on a single platform, though I’ve experienced it on both my Mac and Windows dev machines. Closing and restarting the editor will not fix this, but some combination of maximizing and docking/undocking will temporarily resolve the issue.
Edit: It seems that clicking Window->Bring All to Front will reliably fix it on OS X, until it happens again.
Edit 2: So far as I can tell, opening a dropdown menu or a right click context menu risks causing the bug, but opening menus from the menu bar never causes it, even though menu bar menus are affected by it.
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Disabling the animations did fix it, thank you! I couldn’t find the flag being set to true anywhere in any of my config files (either within my project or the engine install itself), but I managed to get into the editor preferences and deselect the check box.
All of the settings were already on False yet the problem still exist.
Edit: Used Sublime Text 2 and searched for the variable and it was set a second time later in the file. Sorry I had an ID107 Error but its all good now
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