When opening a clients drawing I kept getting this error "Hatch Pattern Too Dense". After doing a little research I came across MaxHatch. This controls the number of elements hatch can create. The default value is 10000. To find out where you sit currently type the following on your command line. Be careful this command is case sensitive.
To increase that number to its maximum copy and paste this on your command line.
(setenv "MaxHatch" "100000000")