Check your screen configuration. The dialog is most likely drawn in an invisible area like a secondary monitor that is not active.
Sorry, here the information that is required:
Version 220.127.116.11 - CS6
Installed recent updates: Yes
OS: Windows 7 Pro (Service pack 1) 64 bit
Model: HP Z420 Workstation
Processor: Intel Xeon CPU E5-1620 @3.60Ghz
Has it worked before: yes. It started after I opened a project (trough "open project") because double clicking on this project gives the follwoing error: "The directory name is invalid". Via "Open project" I could open it.
Do you have any third-party I/O hardware (e.g., AJA, Matrox, Blackmagic, MOTU)? No
Quicktime 7 pro installed
Do you have any third-party effects or codecs installed? Yes, Optical Flares & Trapcode. But is unrelated since it isn't a specific project.
Are you using Render Multiple Frames Simultaneously multiprocessing? Yes
Are you using the ray-traced 3D renderer? No
Thanks for the help. If you need any other info, let me know
Thanks for the suggestion.
I work dual screen, making it only "one screen" didn't solve the problem.