The 01 is the color index 1 for black. Probably means you've enabled nick colors, and set either a colorized rule for $me, or possibly set a rule for * or *!*@* with the box checked for "auto color based on nick". You can prevent this by checking the box in options/irc/logging "strip code", but that strips all the control codes not just the colors

/help Control Codes

Note that there will still remain a colorcode at the very front of each line of the log, but I assume that this is so options/irc/logging/"automatic log and reload" would show everything in the expected color.

--

As for a 'right-click' ignore function being removed, you didn't specify where. The only one that's there by default is when right-clicking on someone's nick, where it should be the 1st item under "control".

If you see scripts or right-click items missing, that can mean that mirc.ini was damaged or lost, causing it to be replaced by a brand new file containing default settings. See both links in my post here:

https://forums.mirc.com/ubbthreads.php/topics/269397/re-all-settings-suddenly-gone#Post269397

Since mIRC has not yet added the feature where it makes an occasional backup, see my script linked in that post, where I create an occasional backup of mirc.ini using a filename containing the day of the week, so eventually when/if your mirc.ini gets damaged, you'd have something from which to restore. Note that my script by default only does this with mirc.ini, but you can remove comments in the script to do the same thing with popups.ini vars.ini aliases.ini etc. The same kind of damage can happen to scripts or other .ini files used by mIRC, but it's far less likely to happen to those because mIRC doesn't write nearly as often to those filenames as it does to mirc.ini

Note: any forum posts containing url's at the mircscripts.net website from 2018 forward almost certainly refers to the modern version of the website, which recently has been forced to move to mircscripts.info, so you'll need to edit that link to my backup script. If you find your script has been reset to default, you can see if you've got a backup created the last time you installed a client update. Just change the wildcard to mirc*.ini vars*.ini servers*.ini etc when you paste this command into any editbox

//echo -a $findfile($mircdir,popup*.ini,0,echo -a $asctime($file($parms).mtime) $parms )