Happy New year!
I've not maintained Alex10 for some time now, there were just too many variables to deal with in order to maintain the Program.
However there are a couple of things you can look into.
Open your web browser and navigate to HA-Bridge and be sure your running the latest version
In the Alex10 data folder there is a x10devicesettings.xml file that contains Alex10 settings, the server port is what HA-Bridge is located at and should now be 80.
It is possible this file has become corrupt if the PC suffered a hard (improper) reboot.
it is possible that the habridge.config file in the same folder has also become corrupt though that should only affect HA-Bridge Alex10 may have locked up unable to start HA-Bridge.
You should be able to open and read both with Windows notepad if you can't view one chances are it has become corrupt.