Beta 7 and 8 have come out since I last updated here. You can use Beta 8 on the instructional machines by typing:
         java -jar ~cs61c/bin/logisim-v20b8.jar

or you can snag it for home use from the Logisim Website.  When submitting bug reports in the future, please be sure to indicate what version of the software you found the problem in.

The list of changes in these versions follows:

Version 2.0 Beta 8 (7 May 2005)

• Bug fix: XOR, Even Parity, Odd Parity gates would emit values even when all inputs were unspecified.
• Feature: Printing output is more polished (temporary circuit state not shown, unused legs on OR/NOR/XOR shaped gates are excluded, etc.)
• Feature: Printer View option added to Options menu.
• Feature: Export As GIF option added to File menu.
• Feature: Wiring Tool automatically repairs wires drawn through the legs of XOR/NOR gates and Controlled Buffers/Inverters. (It already did this for OR gates.)
• Feature: XNOR gate added to Gates library.
• Feature: Poking flip-flops toggles their state (which is now displayed inside the flip-flop).
• Feature: Flip-flops have a pin for asynchronously clearing.
• Feature: Tools have hand-drawn icons.

Version 2.0 Beta 7 (5 May 2005)

• Bug fix: Dragging a four-way wire intersection would disconnect into two wires.
• Bug fix: Added to the toolbar, the splitter tool's attribute set would not update properly.
• Bug fix: With the wiring tool, you could shorten a wire to zero pixels; now, this removes the wire.
• Bug fix: The initial file selected in the Save dialog could be a recently loaded Logisim library.
• Feature: The splitter bit attributes include hints of the direction in which wires are numbered.
• Feature: Splitter bit attributes are editable after being placed in circuit.
• Feature: Tools in toolbar and explorer pane have tooltips.