Because Friend Stream uses basic authentication which was discountinued by Twitter. HTC will have to come out with an update to correct the issue.
Epic Touch 4G
ROM: RUJELUS22 The Blu Kuban FL27 188.8.131.52
Kernel: Kuban_Kernal V0.2.0
Evo 3D Running SOS M ICS (smashed)
Evo 4G Running Stock Rooted. (trade-in)
Viewsonic G-Tablet Running CM7 Nightlys. (sold)
Speed below 4G in St. Louis full bars