The fact that I have been tuning with DHP for 5 years should be some hint as to why I would sorta know what I am talking about here... I have done mail order tuning before without issues like this.
Problems with intense pcm's have been well documented and pinpointed to specific things (knock detection disabling, etc). I have yet to see a "stuck in programming mode omg flashing **** everywhere motor go boom" zzp thread on any forum, nor have I ever heard a story from any of my friends from zzp suggesting something like this.