The same thing just happend to me. Disabled det plugin manually, uninstalled and installed it again.
when accessing mydomian.tld/wp-admin I was hit på a HTTP 500 error.
the error log shows this:
[Thu Aug 07 09:04:32 2014] [warn] [client MyIP] mod_fcgid: stderr: WordPress database error Table ‘myDB.wp_statistics_visitor’ doesn’t exist for query SHOW INDEX FROM wp_statistics_visit$
Same problem here, wordpres 3.8 and plugin 4.1
