I'm getting a very similar error when starting web2py from the CLI in Xubuntu 13.04:
monte@machin-shin:~/web2py$ python web2py.py web2py Web Framework Created by Massimo Di Pierro, Copyright 2007-2013 Version 2.4.6-stable+timestamp.2013.04.06.17.37.38 Database drivers available: SQLite(sqlite3), MySQL(pymysql), PostgreSQL(pg8000), IMAP(imaplib) please visit: http://127.0.0.1:8000/ starting browser... (process:20509): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed web2py appears to start and run normally, with no noticeable problems. -- --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.