I did a test
I uninstalled Mp3tag and removed its folder from Program Files [because there was still config in there]
Then I installed versions 2.61a, pressed F3 to show the filter box and pleced it on the right side of icons. The filter stayed there after closing and reopening of Mp3tag
Then I installed versions:
- 2.66
- 2.69
- 2.70
- 2.71
- 2.72
- 2.73
without touching the settings. And eery time the newer version still remembered the placement of the filter box
But at the end, with 2.73, I've restored my old settings by coping the files. And now the filter behaves like before- it can't remember being on the right side
And from what you are saying, you also have some [bug] setting that makes that
And I as remember, that bug originally happened to me something like 3 months ago