Lost Specific Uploading Capabilities

[gpc10347]

Hey folks,

Here's an oddball that I've created by installing several hacks and, as I like the way to site operates, I'd prefer not to globally uninstall everything (again):

This image and path:

http://i197.photobucket.com/albums/a...atar_48525.gif

results in an Invalid URL error when a user attempts to use it as a Custom Avatar.
(Enter the URL to the Image on Another Website)
Looks fine in a browser and I can use it in a message. I just can't seem to upload it without the Invalid URL

Using the Administation option still errors.

The same image hosted elsewhere does just fine and an unhacked 3.7 install elsewhere handles it as easily as mine does others (whew).

The hacks installed were/are:
vMoods
vBCredits
Favorite Smilies
GoldBrick
ProArcade
vBAdvanced
Radio and TV
Album Pictures Forum Home
and a few style/templates...

Do any of these look like suspects for an issue seemingly only related to photobucket?
(I actually attempted to upload photobuckets homepage logo and it even works...)

Help?