no, it's been happening for most of the summer. I started to use the culator after. I noticed it last year too. I didn't give it much thought till it really clouded up on Saturday. It is clearing now. Could it be that the alkalinity was low? My numbers on Sat were:
FC 1
CC 0
TC 1
PH 7.6 (a little high for my pool, I usually keep it at 7.2 - 7.4)
Alk 60
Cal 220
CYA 40

I put in two bottles of 6% generic bleach and the water went cloudy. Added a dichlor tab to the skimmer (to bring down the ph) Left the filter run all night. Checked the chlorine in the morning and it was FC 15 no CC and the water was still cloudy. Added baking soda. I Checked the chlorine tonight it was 11 no CC - we had a bad storm which added water to the pool along with other junk. The alkalinity was up to 100. I added another bottle of bleach (just in case) and saw the cloud permeate the pool, although the water looked like it was clearing up. I will keep the pump running all night again. So far no stains though!