Usually Ksenos getting stuck in the splash screen means there is either problems in loading the configuration files or database. In some older versions a bug caused the "hotkeys.xml" file to double its size every time Ksenos restarted, so this is worth checking. The configuration files can be found from "%appdata%\Ksenos DVR" – there shouldn't be any files over 1MB.
The database can also have grown too big to be handled properly. The database size should be maximum 10% of the whole recording space. It could also be malformed so Ksenos can't read it properly. Making sure the database and recording disks are not 100% full is also suggested, as is checking the disk for errors.