gbrowse, track rendering error timeout try viewing a smaller region
vi /etc/gbrowse2_dspsp/GBrowse.conf
# Performance settings
slave_timeout = 45
global_timeout = 60
search_timeout = 15
REF:
http://comments.gmane.org/gmane.science.biology.gmod.gbrowse/9084
http://permalink.gmane.org/gmane.science.biology.gmod.gbrowse/10639
http://permalink.gmane.org/gmane.science.biology.gmod.gbrowse/6244
http://sourceforge.net/p/gmod/mailman/gmod-gbrowse/?viewmonth=201305&page=1