BadWindow Error when Importing Project Composite Project

I'm trying to upgrade to 4.5 from 4.0. When I launch I notice that I get a "[DefaultSoapUICore] Adding actions from [<path>] java.lang.UnsatisfiedLinkError: org.mozilla.xpcom.internal.XPCOMImpl.getComponentManager()Lorg/mozilla/interfaces/nsIComponentManager;

but my SoapUI instance seeming launches fine otherwise. When I try to import a project (composite or other) created within SoapUI 4.0 OR attempt to create a new project I get the following error:

ERROR [SoapUI] An error occured [dl.eviware.com], see error log for details
The program '<unknown>' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
(Details: serial 9903 error_code 3 request_code 20 minor_code 0)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function. )

Can you please help me figure out where to go from here?