Thanks for the reply. I'm not sure if I'm doing your first suggestion correctly? If I run "C:\Program Files (x86)\Tor Browser\FirefoxPortable\App\Firefox\tbb-firefox.exe -no-remote" I get the same error message as before. If I run the same command without the "-no-remote" switch, Firefox runs normally (without Tor). I'm not sure if that sheds any light on this problem.
I've also tried the changes in your second suggestion and played around with IntelligentStart and RunLocally true/false choices. Nothing seems to make any difference. I did notice the following lines in the FirefoxPortable.ini file:
"# The above options are explained in the included readme.txt
# This INI file is an example only and is not used unless it is placed as described in the included readme.txt"
Looking at the readme.txt, there is no explanation of anything and no description of the placement of "this INI file." These lines did prompt me to look around a bit and I found another FirefoxPortable.ini file here:
This version looks quite a bit different than the first one, but I did try appending the -no-remote switch to first one, then the other, and finally to both of the lines containing an .exe file (Text in italics
is what I added):
Unfortunately, nothing changed in the behavior of the browser launch.
One other thing I tried, on a hunch, was to launch the Tor browser as an administrator. Surprisingly (at least to me), it worked. I don't intend to run it this way as I'm guessing this is not a secure way to connect to the Internet?
I'm wondering if any of the data from the above experiments suggest a genuine solution?
Thanks again for your efforts to solve this problem.