Can't Log in to correct "side" in new installation

Hello -
Have been using Vassal on a Mac desktop successfully for years. Also on a MacBook (my wife's). My wife recently started disallowing me to take her MacBook when I travel, so I bought an inexpensive Windows laptop for Vassal.
Installation went fine, but evidently I did something wrong the first time I was asked for my name and password. I'm in the middle of a game of Axis Empires/TK! and when I loaded the log file on the laptop, I was not allowed to join as my "side" (Western). I was offered observer, Axis, Japanese, and referee.
I went back to the Mac desktop, successfully loaded the same file, retired, and then saved the file again. Again I loaded it on the laptop, and this time I could choose to log in as Western -- but when I saved THAT file, I could not log in as Western on the Mac!
I uninstalled Vassal on the laptop, re-installed it, and now I'm back to not being able to log in as Western on the laptop. I noticed that I was not asked for a name or password after the reinstallation.
Any help would be much appreciated.
Have been using Vassal on a Mac desktop successfully for years. Also on a MacBook (my wife's). My wife recently started disallowing me to take her MacBook when I travel, so I bought an inexpensive Windows laptop for Vassal.
Installation went fine, but evidently I did something wrong the first time I was asked for my name and password. I'm in the middle of a game of Axis Empires/TK! and when I loaded the log file on the laptop, I was not allowed to join as my "side" (Western). I was offered observer, Axis, Japanese, and referee.
I went back to the Mac desktop, successfully loaded the same file, retired, and then saved the file again. Again I loaded it on the laptop, and this time I could choose to log in as Western -- but when I saved THAT file, I could not log in as Western on the Mac!
I uninstalled Vassal on the laptop, re-installed it, and now I'm back to not being able to log in as Western on the laptop. I noticed that I was not asked for a name or password after the reinstallation.
Any help would be much appreciated.