Often, when Arch is upgraded, things will be broken. This is a list of ways problems have been solved in the past. Hopefully it will be helpful for solving issues when upgrading in the future.
System
Boot Problems
Once in a while there will be no keyboard input at the login prompt. The cause/fix is currently unknown, but boot debugging might help to find a fix.
WiFi
If wifi does not work after upgrading, try reinstalling broadcom-wl-dkms
# Remove current installation
sudo pacman -R broadcom-wl-dkms
# Install the package again
yaourt broadcom-wl-dkms
# Reload the kernel module
sudo modprobe wl
# Double check that you can see available wifi connections
wifi-menu
Applications
VMWare Workstation
Post Install https://askubuntu.com/questions/689123/vmware-wont-work-after-ubuntu-upgrade
The solution below applies to versions of VMWare prior to 12.1.0. The 12.1.0 version of VMWare does not require this fix.
VMWare and VMPlayer are in fact looking for a specific library string. You can execute VMWare/VMPlayer from the terminal by executing
export LD_LIBRARY_PATH=/usr/lib/vmware/lib/libglibmm-2.4.so.1/:$LD_LIBRARY_PATH
then vmware or vmplayer
I made this a permanent change on my system by executing instead
executing sudo nano /usr/bin/vmware and adding the line
export LD_LIBRARY_PATH=/usr/lib/vmware/lib/libglibmm-2.4.so.1
after the line export PRODUCT_NAME...
Press ctrl+o to save and ctrl+x to exit: VMWare will now work.
To perform the same function for VMPlayer, execute the same changes to /usr/bin/vmplayer