I would welcome a free drink for every time I have watched anglers cast a marker float out and not be able to get it to rise, then repeat the process again and again whilst spooking anything that may have remained there after the first cast.
Some real experienced anglers I see suffer this problem as well and the biggest cause is braided line or braided leaders. Yes, all the magazines tell us we need braided line for marker work, but for many years now I have used a Co-polymer or a fluorocarbon leader on the end of my braid to stop the frustrating habit of the marker float spinning around the soft braid on the cast and temporarily tangling, which prevents the float from rising. Using too small a lead can cause this too, but this can be seen during the cast as the float separates from the lead.
Saturday I had landed a nice mirror during the morning whilst conditions appeared absolutely spot on with a big low which had moved in dropping the air pressure fast, whilst the wind blew strongly and boy did it rain. These were the conditions I had hoped for to get the fish down in the 19 feet of water I was fishing.
That evening three really nice commons were induced to feed.