Four digit tracknumber disables group tag functionality?

[hvaleton]

Hi Simon,

It's been a long time since I posted something on this forum, but today I stumbled upon a very strange problem:
Recently I've changed the way I populate the Tracknumber tag. For multiples cd's it goes like this:
Tracknumber = <m><n>
where m stands for the discnumber and n for the (original) tracknumber.
<n> is always padded with one leading zero.
<m> is only padded with a leading zero when there are more than 9 cd's in an issue.
So, for instance, the seventh track of the fourth cd in a 10 cd issue has Tracknumber 0407.

Until recently the maximum number of digits in any tracknumber throughout my collection was three, but now it can sometimes be four.
And only with those albums/issues having four digit Tracknumbers I've encountered the problem that the group functionality in MinimServer ceases to function entirely. And I don't need to tell you how well I like this grouping!
Could this be a bug?

I've added a screenshot of Kinksky desktop containing a number of performances of Mahler's first symphony, where two of those (under Chailly and Sinopoli) come from a large multiple cd box and therefore have four digit tracknumbers. The rest of them have three digits at most.

Thanks very much for your time and I'm still very much enjoying your software on a daily basis!

Hans Valeton