Have a MAC with OS X 10.7 & latest Safari, uploader working but very item description field very laggy. Tried Firefox 23.0.1 but uploader just sits dormant with no action. Tried a Windows 7 PC w/IE 10, but inconsistent ability to get a cursor to show i Item Description field. Was told we were still using old version of Item desc. tool & can switch to new version in account preferences, but caution if you change there is no going back. Although everyone will be pushed to use new version soon. Works with MAC is what I was told, didn't try it as I'm having enough trouble with the uploader. On MAC I installed the 64bit version of the Opera browser and although the interface is a bit different, Item Description editor works as well as the uploader. You have to make sure you get the 64bit version as 32bit won't allow the uploader to load at all. The 64bit file will have x64.exe file extension (ftp://ftp.opera.com/pub/opera/win/1214/en/). We've been working at this for hours & many different work arounds and downloads. I have it currently working with the previous instructions but I have no idea
if this will work for everyone's configuration. I'm trying to pass on 1 possible solution. Oh yes I almost forgot, tech support was able to replicate the uploader issue that we sent earlier & are working with the developer for a solution.
I hope this helps someone, good luck!