The profile selector dialog size depends on the number of profiles it presents. If a customer enter many profiles, the profile selector will grow larger than the screen, obscuring parts of the dialog.
Created attachment 755 [details] Example of tl-select-profile with a large number of profiles
The profile chooser got a redesign in bug 6099 which resolved this issue. The list of profiles can now scroll.
Circular reference there. The actual bug is bug 7691.