same here: Firefox plugin works fine first few times then only black or nothing is displayed when opening a PDF. When it has stopped working there is a defunct acroread process:
$ ps -A | grep acroread 5429 ? 00:00:01 acroread <defunct> Versions: $ firefox -v Mozilla Firefox 3.6.16, Copyright (c) 1998 - 2011 mozilla.org $ acroread -v 9.4.2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/731966 Title: acroread plugin for FF corrupted display -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs