Reading Directory on opening.

I have been using MP3Tag for about 3 months and have found my way round OK. I recently updated from Version 2.63 to Version 2.65a.
Since using the latest Version it seems to work in a different way. As soon as I "Open" the program a drop down box appears stating "Reading Directory" and proceeds to read all the files I have tagged in the past and puts into the "working screen". I have to remove all these files before I can continue. This has not happened before today.
I would be grateful for any help you can offer.

Could you check if the problem disappears if you rename the mp3tag.cfg prior to opening MP3tag?
It could be that for some inexplicable reason that this file is corrupt.

Rename it so that if it does not help, that you can rename it back.