display problem

Hello I have a little problem I have repaired a program, I have all the functions working no worries at this level, but as soon as I launch it the screen freezes it continues to run there to do but I can't see anything. Does anyone have any idea where this could be coming from.
Sorry for the translation, she just googled.
THANKS

check your script/api for a disablerendering() when the bot is started. disablerendering() will freeze the screen as togglerendering() will hide it