The module has been completely rewritten to fix all the open issues and introduce new features. Please refer to the recent commits and fixed issues to understand what has been changed. Although, I have added an update hook to make sure updated database changes are done for existing users as well I would still recommend reinstalling the module again.
7.x-1.0-alpha7:
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New: Add counter.css to styling your output, align value to right
Bug fix: Thousand separator for Visitors statistic
Bug fix: Use hook_permission rather than depreciated hook_perm
Bug fix: Fixed admin/config/counter blank page
6.x-2.23:
Fix: Detect real IP whenever behind Proxy
Fix: Remove "view counter" on Permissions page, because we already have "Show block for specific roles" in Blocks Configuration
Fix: Remove README.TXT, use http://drupal.org/project/counter instead
7.x-1.0-alpha4: Bug fix: avoid any SQL injection attacks by using the database abstraction layer
Bug fix: meet Drupal Coder module standard
7.x-1.0-alpha5: Reupload
7.x-1.0-alpha6: Reupload