Code Access Security - Full
IIS user account has full permissions on all files
New database/user/password created in Plex 
Connection string connects.....
DBO user box is checked on install page.
File and Permission check OK
DB installation fails:


Install stops at 18% error 
 System.Data.SqlClient.SqlException (0x80131904): User does not have permission to perform this action. User does not have permission to perform this action. User does not have permission to perform this action. at System.Data.SqlClient.SqlConnection. (SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection. (SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at DotNetNuke.Data.SqlDataProvider.ExecuteScriptInternal(String connectionString, String script, Int32 timeoutSec) ClientConnectionId:d1a6a154-8729-430d-bdd2-747fac675d72 Error Number:15247,State:1,Class:16 

Any troubleshooting clues? Thanks

No. Never have been able to change this property before and has never been an issue with new installs or update. Shared hosting service.