yes this issue is known.
It is also fixed in the development tree. We will release 0.16 with this fix and similar small fixes soon – maybe even today.
We actually tested on IE 5.5+, Firefox 1.0+ (and the other Mozillas: 'Suite','SeaMonkey','Minefield') and Opera.
Firefox before 1.5 was a big problem actually, butwe finished that as well! Old/traditional Linux browsers (Konqueror most notably) won't work due to missing AJAX support.