Thank you for reporting strange behaviour of the UTGB.
As you mentioned, we have implemented vi-like short cut keys for
relocating browser window:
h (move to left)
l (move to right)
We will fix the reported problem by disabling this feature when the
browser forcus is on the text box.
Taro L. Saito
University of Tokyo
Tel. +81-47-136-4065 (64065)