Thanks daas88! Problem solved. Below are the steps I took to fix the problem:
1. Downloaded:
Flash Player 10 for 64-bit Linux
2. Removed the flashplugin via Synaptic Package Manager
3. Extract file (libflashplayer.so) from libflashplayer-10.0.32.18.linux-x86_64.so.tar.gz into /usr/lib/mozilla/plugins/ via Alt+F2, "gksu nautilus"
4. Rebooted (
Not sure if this is necessary, but I tried launching Firefox after I installed new Flash plugin and I was having problems. Reboot seemed to have solved that problem.) Everything is working fine now.