It's a file named hs_err_pid####
Do you have any files with the name error-########-.log in which all the number symbols are unique numbers in your Mythruna directory?
No. Only a few client files, just named client (or client-2, etc).
This is in the client files:
2013-08-14 17:18:20,531 INFO [mythruna.client.MainStart] Build version:20120627