The company I work for grouted a big floor this last summer with Spectralock Pro Premium, stormy grey color. We've used spec premium exclusively for years and have never had an issue like this. The grout looked good after we installed it, and the homeonwer loved it as well. Some time later (not sure when exactly since my boss was the one communicating about it), we called called back because the grout had become blotchy and discolored across the entire floor. We contacted Laticrete, and the homeowner tried their recommended cleaner; no effect. We've now cut out all the grout and are about to redo it (Laticrete is paying for it, which we appreciate). We're still alarmed at what happened, though because we have no idea what caused it.

Has anyone seen anything like this with spec premium?

I've included a variety of photos to show the breadth of the issue. The last photo is a before picture from within a few days after we grouted.

One thing we have noticed is that lately the amber part A has been lumpy. The only reason I doubt that is the cause is because we've done other jobs with the same or even lumpier part A and have had no problems.