I do not know if this bug already has been brought back but very rarely using the favorites and opening the channels from the window, the channel is opened “#-n”. It does not happen with the 6.21

That may happen if you have overriden the /join command with a poorly written alias, for example

/join /join #$$1-

and you have enabled the option "Minimize on join" for a channel in Favorites. mirc executes internally "/join -n <selected channel>". This calls the above alias, which prefixes -n with #, thus making mirc join #-n.

I suggest you avoid aliasing mirc commands or at least do it carefully.

Yes, an alias is the most likely cause. The channels folder uses the /join command to perform joins, so if you have an alias for /join it will be used. mIRC 6.3 was fixed so that it correctly passes the -n minimize switch in the /join command for channels that have the "minimize on join" option enabled.

Sorry! I have corrected the error with one control on the alias join:)