this is a new one for me. I googled dbgdel.cpp and mostly ended up with my eyes crossed since its C++ stuffs

so i could be way off base with my speculation/guess. As near as i can figure, it may have to do with an incorrect memory allocation problem and/or corrupt dll. Have you downloaded any dlls of late to use with mIRC? New scripts?
Are you joining the network server with mIRC or thru a website?
Hopefully one of our C++ gurus can educate both of us about what could be causing this for you.