1) Open mIRC options (Alt+O)
2) Go to the 'IRC'section, and make sure subtree is open (if there is a + next to 'IRC',
click it to expand)
3) Go to the 'Logging' section.
4) Find the option 'Reload logs:'
5) Drop down box > choose 'Chats'
7) Click OK.

* 6) Find the option 'Automatically log:' see if drop down box is set to 'Chats' or 'Both'