* /write: error writing 'C:\Users\User Name\AppData\Roaming\mIRC\test.ini' (line 100, AutoIJ_Remote.ini)

Run mIRC and, in the status window, type //run $mircdir and press the enter key. This will open the mIRC AppData folder in an explorer window. Now try copying a file in explorer. For example, right-click mirc.ini, select copy, and then right-click in the folder and select paste. Does it create a copy of the mirc.ini file? If it does, then it probably is not a permissions or read-only issue.

Are you running anti-virus software? If so, it could be blocking mIRC. If you disable your anti-virus software, or add an exception for mIRC, does that resolve the issue?