Not relevant, only affects editor
Steps to reproduce:
1. Use C2 a lot (I presume)
2. Add any event + action
3. Open an action
There are no buttons. ENTER and ESC still work, but nothing clickable.
Note: Resetting dialogues in the menu will correct it, but it's strange this could happen at all.
Internet Explorer: n/a
Operating system & service pack:
Windows 7 64 Professional SP1
Construct 2 version: