Comment 5 for bug 609834

I fail to see the relation between taskbar thumbnails, the amount of tabs, and the inability to minimize DC++.

for the first problem, they may be globally disabled (for the whole Windows system, not just DC++) if you feel they bother you.

the amount of tabs shouldn't be an issue. after about 15 tabs, Windows switches from thumbnails to a regular list on my system. but in any case, that shouldn't matter when it comes to minimizing the app.

as to the actual problem (can't minimize), we'll need more info to help out. on a regular Windows, DC++ minimizes just fine regardless of the amount of tabs.
any particular Windows theme?
where exactly do you click?
which DC++ minimizing / tray settings are enabled (Settings > Appearance)?
does globally disabling taskbar thumbnails fix the issue, to see whether your hunch was correct?