I had a middle of the night idea about fixing avantgo. Last week I installed webwasher (don't let the sales pitch fool you, if you read the fine print the program is free for non-comerical/non-business use). It uses a proxy website to clean all the annoying pop up windows and banner ads from websites I might visit. The solution for avantgo was simply telling the avantgo connection to bypass webwasher's proxy website and connect directly to the internet.
Duh, I should have figured that out much sooner, but I was thinking it was a problem with avantgo not a conflict with something else.