Humboldt Nutrients Master A&B

Has anyone heard any info on the master a&b having different ingredients than when it originally came out? The guy at the hydro store i go to said theres a change in the recipe and is causing potassium lockout with no apparent remedy offered by the company. So now hes telling me to switch to another brand. Anyone else heard of anything like this?

I was just told something similar I'm from around your way did they tell you that at harry's? They were trying to sell me something different so I thought it was a sales pitch.

Nope....

And i just got done using it with no such issue.

I used it for a few crops. It did fine at first, but it seemed to get really hot at after it was about a year old or so.

It started burning the hell out of my plants. I guess those chelated mineral are some powerful stuff.

I have since gone completely organic and couldn't be happier.

Well I went to another hydro store and heard the samething that humboldt changed their formula for master a&b and people are having problems since the switch. I guess I'm switching to advance.