I'm not sure if you fully understand what I said. FTP should just work as FTP, until users do not manually choose something other. Automatic changing of something when you just OPEN settings without touching anything doesn't make any sense.
@IronTechmonkey
The contextual change of FTP prefix to which you refer is described in the FAQ, in fact it is the crux of that server security post which comes from technical articles describing how FTP(S,ES) functions, not from MiXplorer. The FAQ admittedly focuses on the creation of a bookmark at the other end of the exchange but it stands to reason that the server configuration would make similar dynamic contextual adjustments during initial configuration. MiXplorer may auto populate prefixes for us contextually because those changes are required to make a good/secure connection.
Keeping in mind that (as described in the FAQ) this new server set up involved huuuuuuuuuuuge changes (seriously, perhaps the biggest server changes since their inception) and in that scenario, the fact that those dynamic contextual changes are happening on your first and second run through the server settings seems normal.
The only time I've ever seen changes to that prefix on a configured server is when it adjusted to changes that were made in the settings. After configuration does it keep flipping back and forth each time you open it even if you;ve made no settings changes (which would be weird) or does it do so just during your first and second attempts (which would not be weird)? Does it happen after you configure the server?
It may be the case that you've found a change in behavior between 6.57 and 6.58 which needs a fix or an explanation. If you think you've noticed something untoward it would be more helpful to report it as described in post seven of the FAQ, and include specific details about the device and a step-by-step walk-through (every tap, long press, swipe, etc) of how to reproduce it along with a log captured while you reproduce the circumstances. Some of these things may seem obvious during a thread discussion but when getting to the nitty-gritty of testing those details are particularly helpful.
I've gone a bit hard at you for previously not checking the FAQ and you earned that initially, but just to be clear: my interest here isn't to browbeat about that. As recently mentioned in this thread, I'm planning a rewrite of the servers documentation to cover the recent massive changes. You may (or may not) have found more changes; it's that which I am trying to drill down to.