English 
Japanese I have released Contact Form 7 2.1.1. This update includes a fix for an issue reported that the earlier release conflicts with other plugins. If you see a conflict issue with Contact Form 7 2.1, I highly recommend upgrading quickly to this new release. I would recommend that you upgrade even if you aren’t having issues currently in order to avoid future difficulties.
Changelog
- Some other plugins that attempt to include files in inadvisable way were conflicting with Contact Form 7 2.1. A workaround for avoiding these types of issues has been introduced.
- Translations for Chinese (traditional; James Wu), Danish (Georg S. Adamsen), German (Ivan Graf) and Italian (Gianni Diurno) have been updated. Translation for Afrikaans has been newly created by Schalk Burger.
- In addition, this release has a few bug-fixes and improvements.
Could you provide more detail on which plugins were causing problems? I’ve upgraded already, but curious.
I’m working on my site to try and make sure the CSS and JS load only when necessary, as detailed here: http://contactform7.com/2009/11/22/loading-javascript-and-stylesheet-only-when-it-is-necessary/
And I’m partially successful, but see some oddities. I know you don’t want to do support here, which is fine. Just hoping for more details on what you changed, so I can figure out if it’s a factor or not.
John, you can see the detail of the issue on this topic of the support forum.
[Plugin: Contact Form 7] wpcf7_add_tag_generator undeclared