I seem to be having a similar issue. I never had krusader set to auto start, so I am use to being able to access the WebUI immediately after starting the Docker. Since I updated to 6.12.6 last week, I've noticed that I cannot access the WebUI for krusader immediately. It is definitely less than an hour in my case though. I think 20min or less. So, it seems to be a slow start issue and not really a show stopper, but it is interesting that it only started after upgrading to 6.12.6.