I had some problems with some scripts after updating to 7.14 so i had to change some stuff.
After restarting mIRC several times in a short time i got the errormessage:
* Connecting to IP (6667)
* Unable to connect to server (Address already in use)
After 2 two minutes of waiting i changed the IP to the FQDN and i was able to connect without a problem, after ~30 minutes i tried to reconnect to it using the IP address and it worked fine.
I hope it helps.