I was having the same problems posting and using the Quote button for replies , I'm running Windows 7 and IE . I have automatic updates and it turns out that IE had updated and was causing all of the problems and by uninstalling the update everything started working again . Go to the Control Panel and check your updates and then turn off "Automatic updates" .
Photobucket also is not compatible with the latest version of IE so uninstalling the update should fix that problem too .
If not , make sure you have the latest version of Java installed . Go to the Java website for the free download and to make sure that Java scripting is "enabled" on your computer . You can't copy links in PB if it's not "enabled" !!