Hi "Seeker",
I went and read the posts at Opera site. I haven't heard of Proxo causing a problem like you were discribing, but I know that you where having some problems. I however use an older version of Proxo than you were using, but looking at the code there is nothing in the version that I use would generate any registry keys. I know that every machine is different and what works on one doesn't always mean that it does the same on another one. I have my Proxo set-up so tight that I have to "by-pass" sometimes to download from some sights, but it's because of the Java Filters that I have enabled.
I have a suggestion, since now know how to take out the combination of things to solve the download problem, why don't you try Proxo 4.1 or 4.0. and see what happens? I know by your post that you like and miss the Proxo program, I would too. If you need installation files for 4.1, I can supply you with them.
Please let me know how it turns out. Keep in touch MY FRIEND.
"Jak"