1. Close EM and restart it
2. Don't edit anything in EM. Make sure you save it as a script.
3. Always DROP and recreate, don't alter (this is a personal choice, but views become dicey)
4. Do sp_helptext trigger_SetImagePath, in QA, and tell us what you get
5. Post the T-SQL of the trigger so we can take a look (which won't be able to do, unless you saved the script, see item 2)