I have CS6 running on Win7x64 and when I try to launch it, it gets as far as the Color Efex 4 plugin and just sits there 3-5min then loads.
Tried it with botyh 64bit and 32bit Photoshop. When I remove the plugin, Photoshop loads in maybe 5 seconds.
Lightroom 4 loads just fine, and Color Efex on its own loads fine, just seems to be with Photoshop loading the plugin during the splash screen.
I just formatted my computer a few days ago, so figured no biggie, maybe something installed improperly so formatted the system again and reinstalled everything... and same issue.
I have tried numerous uninstall/reinstalls, used the CS5/CS6 cleaner tool, tried installing CS6 then updating before adding in Color Efex, tried installing and running without any updates and same issue.
Tried the solutions found at https://support.google.com/nikcollection/answer/3004716?hl=en&ref_topic=3002203 as well.
Not sure if a Color Efex issue with Photoshop? or a Photoshop issue with Color Efex, so, thought I'd post here and see if anyone else had this problem and maybe found a solution.
Did it work before? If not then contact Color Efex and lay out the problem with PS.
Never worked. Also, trying to determine which is at fault... as mentioned, could be a prob with efex, or with photoshop.
I've seen posts from people with the same issue online, but more often than not, they're using a MAC so, not overly helpful. That being said, I'm sure a few people on here may have had the issue and may have some insight.
You need to contact Google/Nik, see if there are updates, and if not, let them know about the problem so they can fix it.