Hi nettieg,
I did the same with iCab on the iPad what I do on my PC.
I log into Facebook, go to one of my groups, click on albums, click on add photos and then I can choose from the iPad's photo album. I tested it with settings - browser ID : standard and Safari iPad, both worked.
But I switched from standard to IE to safari to standard. First with standard, it did not work, with IE it did not work, then safari - it worked and when I switched back again to standard it worked again. Strange, but in the end it worked.
Does this help?
Knut