Are you sure, if this bug has been fixed?
toolbar -r
toolbar -au girclagbar "Gamers.IRC Lagbar" @lagbar /lagbar_refresh1 @toolbar_lagbar1
toolbar -as girclagbarsep
toolbar -fs
toolbar -fl
results in:
* /toolbar: no such file 'D:\IRC\Gamers.IRC 5.15\@lagbar'with mirc 6.3 and 6.31 (tested both)
If you want, I can send you our stuff so you can find out where the problem is.