I have this problem as well. . I use this work-around.

If you go into the Band-in-a-Box directory and look for a file called,

PluginScanLog.log

Open it with Windows notepad and look for a line that says,

... 131 candidate plugins were counted.

Note that your number will most likely be different then mine. Make a note of the number and close NotePad.

Now, in the Band-in-a-Box directory, look for a file called,

DXPluginList.ini

And open it with NotePad. Scroll down to the very bottom of the file and change the entry 'RawPlugCount' equal to the number noted earlier.

Do the same thing with another file called,

DXiPluginList.ini

This works for me and I hope it helps. It doesn't actually fix the problem, but it prevents Band-in-a-Box from doing a plugin scan when you start it and at least gets you into the program.