Problem solved. I decided to purchase a new dispenser tray and was pleasantly surprised that LG had updated the dispenser. LG added a small hole in the bottom. Thank you, LG. No more overflowing dispenser, no more puddles on the floor. For WM3900 order this part from LG: AAZ75735901

An additional point to mention: Thanks to everyone's advice on this forum, we learned many great tips that manuals either don't mention or they gloss over. Several posters have mentioned to empty the remaining water from the detergent dispenser in order to reduce the chance of mildew. Along with wiping down the gasket, leaving the door open, etc., we dutifully emptied the detergent dispenser (usually about a teaspoon or so of water left in there.) Only recently did we accidentally find that we can remove not only the dispenser that holds detergent, but the entire drawer that includes the detergent, bleach, and softener dispensers. And when we empty the entire drawer, we easily get a quarter cup of water. That's way more water than what's left around the gasket or on the inside of the door. This may have been mentioned in previous posts and we just missed it, but maybe mentioning it again might help a few more folks. Of course, we may just be the last folks in the universe to find this out! :)

I have a LG FL (4 years old) and mine have always done the same thing. Before I started using Charlie's Soap, I always used vinegar as my fabric softener. I did notice that the liquid that was left in my fabric softener dispenser was never vinegar, it was always just plain water. I assumed that the water from the machine flushed out the vinegar and just left water in there from the "flush". I never checked a manual to find out if my assumption was right or not though, but after 4 years of use, it's never harmed anything. PJ

@posskat, glad to hear that you are happy with your LG. I really like mine too. As far as your issues are concerned, I don't use vinegar in the wash but it's strange that it leaks out. I use fabric softener diluted with water and have no leakage from the FS compartment in the dispenser. You should check the dispenser to make sure that it's not cracked or assembled wrong - it shouldn't be leaking out before the last rinse. You are right about the door - mine can only be left open fully or half way too. I have the same issue as you do with the washer being located in a busy hallway leading to the garage. I usually do my washing in the evening and leave the door open overnight and then shut it the next morning. That seems to be sufficient for the washer to dry out. As to the borax and oxy bleach: if you are not using the prewash option, you can remove the liquid detergent insert and just put your liquid detergent together with borax and oxy bleach directly into the main wash compartment. If you are using prewash, then I think your only option is to switch to powder detergent (which may be a good idea anyway) so that borax and oxy bleach can be dispensed into the main wash. Oxy bleach needs time and higher temp to do its job. I don't think it's effective in the short prewash portion of the cycle.