When we activate the plugin we lose the Dashboard completely and have to rename the plugin via ftp to access admin. Any ideas on what could be causing the error?
I will assist you to resolve this asap.
A 500 Internal Server error is usually a masked PHP fatal error. So turning on PHP error_reporting or debugging in the form of WP_DEBUG set to true in wp-config.php should show a more descriptive error instead of just the status code.
Since it is upon activation, in most cases this relates to PHP memory_limit running out due to the spike in memory usage upon activation. Can you please increase your PHP memory_limit and see if that resolves it?
Please see this post and instructions on increasing PHP memory limit in WordPress http://tribulant.com/blog/general-news/wordpress-increase-php-memory-limit/
I look forward to your response.
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