EM, there's now a problem with the 'Upload a file' function. The 'Browse' pop-up no longer appears. Instead is a 'Save' dialogue box.
BTW, when upload has been mended the file upload limit of 32GB is massively OTT and will clog up the site in no time. It is also problematic for users with capped broadband or dialup.
WinXP SP3, latest FFox (24.0), latest Flash (11.8.800.168).
Problem occurred both with Reply button, Upload-a-file button and with More Options. Now sorted !
To overcome the prob I had to uncheck the 'Use the Flash-based uploader' option in Preferences.