OK, that's the original error you reported and which I may have overlooked.
But that's not the issue to which I replied. I was talking only about the error of a corrupted table, the query that had this at the end:
Incorrect key file for table 'ipbcore_rc_index';
But this text:
OutOfRangeException: (0)
#0 /home/****/public_html/system/Member/Member.php(779): IPS\Patterns\_ActiveRecord::load(3)
#1 /home/****/public_html/system/Patterns/ActiveRecord.php(335): IPS\_Member->get_group()
#2 /home/****/public_html/system/Dispatcher/Standard.php(87): IPS\Patterns\_ActiveRecord->__get('group')
#3 /home/****/public_html/system/Dispatcher/Admin.php(90): IPS\Dispatcher\_Standard::baseJs()
#4 /home/****/public_html/system/Dispatcher/Dispatcher.php(110): IPS\Dispatcher\_Admin->init()
#5 /home/****/public_html/admin/index.php(13): IPS\_Dispatcher::i()
#6 {main}
at least suggests a second, and maybe unrelated, problem.
Can you please verify that the connection details in the Client Area are current and working, then reply here, and we can take a closer look at this for you.