Cron won't run applications

I use LuckBackup and have it setup to run every night at a certain time using cron and I noticed that Luckybackup will no longer start as scheduled. It seems like any application that requires the "X server" will not run. I tried the following test schedules to see if they would work and the only one that works is the "touch" command which doesn't use the X server.
12 23 * * * touch /home/gumper/crontest.txt
02 21 * * * export DISPLAY=:0.0 ; /usr/bin/gcalctool
02 21 * * * export DISPLAY=:0.0 ; /usr/bin/luckybackup
After cron tries to run gcalctool and luckybackup I get the following messages emailed to me:
Invalid MIT-MAGIC-COOKIE-1 key
(gcalctool:4124): Gtk-WARNING **: cannot open display: :0.0
And
Invalid MIT-MAGIC-COOKIE-1 keyluckybackup: cannot connect to X server :0.0
From comparing my pacman log and when Luckybackup stopped running as scheduled, it appears that it started immediately after installing Gnome shell and Gnome 3.
Any ideas on how to fix this?

ewaller wrote:I don't have a solution, but did you try the other solutions for X Apps the in the cron wiki page ??
I'll give the "xhost" command a try to see if it helps.

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