Forums Bug Reports [7.45] mirc.ini reset to default, servers wiped

You shouldn't be directly deleting mirc.ini at all, you should be writing a new file and then using ReplaceFile() to move it over to mirc.ini.

There is nothing left to be tracked down. You could easily reproduce this problem yourself simply by inserting an exit(0) into the existing code and looking at the results - the problem is what happens when the code doesn't complete, not why it doesn't complete (whether it's power loss, a BSOD, or something else).