Browser Based AIR Help Publishing Issue

My publishing workflow for browser-based AIR help has performed flawlessly until recently. I now receive publishing failure notices (as pictured below) without exception. Up until December 15th (when I made my last update), I have never encountered any problems. I have made no overt changes to my computer configuration. I am of the opinion that this issue is specific to RoboHelp as I am still able to successfully utilize the exact same destination and server information to upload content in both Dreamweaver and Filezilla without any issues. I have tried to remedy this using RoboHelp version 8 and RoboHelp version 9 on a second computer as well. HostGator tech support (which is excellent by the way) states that the information I am using is accurate.

Sure I can still overwrite all the content using Filezilla but that's hardly an optimal workflow.

I am stumped and would appreciate any thoughts.