Segment Violation at (nil) in Quartus II 10.1 on Linux

Hi,

I just installed the 10.1 version for Linux (on Ubuntu 10.04), but whenever I try using the Block Tool to draw on the Block Diagram/Schematic window, I get the following error.

*** Fatal Error: Segment Violation at (nil)

Module: quartus

Stack Trace:

0x2bcee2: QPainterPath::intersected(QPainterPath const&) const + 0x72 (QtGui.so.4)

Followed by the error trace.

Any ideas on what's wrong???

Thanks,