Ok. So it seems the two issues are connected after all and was related to a change between 2.2.2 and 2.2.3.
However, the change was related not to anything to do with attachments but, rather, our JavaScript that provides multi-quote sorting. It seems the issue only shows up when multi-quote is used, and wasn't directly related to attachments hence why it was tricky to track down and didn't obviously show up when we were reviewing changes between 2.2.2 and 2.2.3.
This is fixed in XF 2.2.4 but we acknowledge that this may be causing some fairly significant issues.
In the meantime, feel free to download our current copy of the fixed code which is available to download from here:
[URL unfurl="true"]http://xenforo.com/community/js/xf/nestable-compiled.js[/URL]
(Right click, save as, upload to your XF installation replacing the existing js/xf/nestable-compiled.js file.)
Note: If you are running your forum with $config['development']['fullJs'] = true; enabled then you will instead need to download and replace js/xf/nestable.js.
When you do this, XF will warn you on an ongoing basis that your nestable-compiled.js file has unexpected contents. This can be safely ignored and will go away once you have upgraded to XF 2.2.4.
Let us know if the fix works for you.
