Hmm... I'm not able to reproduce this one. Making new plugins of various types (masterless/with & without Update.ESM dependency) is still working on my end. Odd.
Win7(x64)
For what it's worth, can't reproduce the issue on my end - Windows 7 x64.
These two posts prompted me to go looking for another cause.
I eventaully narrowed it down and found that a setting in Comodo Firewall Defence+ is causing my problem.
If you're using Comodo Firewall with Defence+ activated, then you have to uncheck the
Windows/WinEvents Hooks checkbox. To do this, open the Comodo Firewall panel and click the Defence+ tab. Select Defence+ Settings (another box pops up). Select the Monitoring Settings tab and then untick the
Windows/WinEvents Hooks box.
[Edit] Strangely enough, I have Comodo on my 32bit Win7 install as well and it doesn't interfere with the open/save dialog boxes.
If you're having the problem, but using a different firewall/anti-virus package, then I'd suggest you look for a similar setting in your firewall/AV program and disable it.
I'll add this in the CK bugs post and you guys can confirm if it's working for you.
I can now get back to using the CK again.