If you ever experience an issue with displaying unicode characters (which is not just an encoding issue), try type:
/setoption Messages UseDrawText True
This will enable a different (but slower) method for drawing messages.
To disable, type:
/setoption Messages UseDrawText False
If you need to be authed with nickserv before joining a channel, you can use the /sleep (or /timer) command in your serverlist "Run these commands on connect" field:
/msg nickserv identify <password> /sleep 3 /join #channel1,#channel2
/sleep 3, means wait 3 seconds before running the following command.
The new serverlist has this feature built-in as well as SASL support which makes this a non issue.
When you select text from the message buffer, AdiIRC will automatically copy the text to the clipboard when you release the left mouse button.
If you prefer to manually press CTRL + C, you can go to Options -> Messages and disable AutoCopy selected text to Clipboard and AutoFocus Editbox.
These options might be merged into one soon as well as a feature to ask which method to use.
If you experience problems connecting to a TLS only server, you can try the .NET 4.5 version which has support for TLS 1.1 and TLS 1.2.
You can disable or change the CTCP VERSION reply using the CTCP event in a small script.
This can be used for any CTCP request.
; Disable CTCP version reply. CTCP *:VERSION:*:halt ; Reply with a custom version. CTCP *:VERSION:*:ctcpreply $nick IRC Version 42 | halt
Tips for various events can be disabled in Options -> Tips, to disable highlight tips, go to Options -> Highlights, in the listbox area select "$me", then click the "Edit" button, uncheck "Tip message" and click "Save".
Go to Options -> Highlights, in the listbox area select "$me", then click the "Edit" button, set the sound dropdown to "No sound" and click "Save".
AdiIRC supports only PFX certificates, you can convert a PEM certificate to PFX using this openssl format:
openssl pkcs12 -export -out mynick.pfx -in mynick.pem
For creating a new certificate, have a look here
To update to a beta release, just type /betaup.
There is a tiny "|" separator to the right, if you right click the Toolbar and choose "Customize", you are able to drag the item to the right of that border.
Things you can try:
The default options used when connecting with /server or from Menubar -> File -> New window can be changed in Options -> Quick Connect.