I have added the following URL to my profile as an article: http://doi.ieeecomputersociety.org/10.1109/MM.2010.78
The page gets retrieved ok during the initial edit, but the link that gets placed on the rendered profile page is: http://www.computer.org/portal/web/csdl/doi/10.1109/www.computer.org/csdl/mags/mi/2010/05/mmi2010050066-abs.html
This just shows an error, so I took just the last part (www.computer.org/csdl/mags/mi/2010/05/mmi2010050066-abs.html), which is a valid link, and added it again. This still gets re-written, this time as http://www.computer.org/csdl/mags/mi/2010/05/www.computer.org/csdl/mags/mi/2010/05/mmi2010050066-abs.html
This version of the link gives a 404 error.