Comment 4 for bug 238293

gThumb seems to have the same problem, printing on the Epson device.
contents of /var/log/cups/error_log is
-----------------
E [08/Jun/2008:09:23:17 +0200] Resume-Printer: Unauthorized
E [08/Jun/2008:09:25:58 +0200] PID 6524 (/usr/lib/cups/filter/pstoraster) stopped with status 1!
E [08/Jun/2008:09:25:59 +0200] [Job 22] Job stopped due to filter errors.
E [08/Jun/2008:09:38:22 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:09:38:49 +0200] PID 6545 (/usr/lib/cups/filter/pstoraster) stopped with status 1!
E [08/Jun/2008:09:38:49 +0200] [Job 23] Job stopped due to filter errors.
E [08/Jun/2008:09:44:09 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:09:45:03 +0200] PID 6576 (/usr/lib/cups/filter/pstoraster) stopped with status 1!
E [08/Jun/2008:09:45:04 +0200] [Job 24] Job stopped due to filter errors.
E [08/Jun/2008:09:49:34 +0200] cupsdAuthorize: Local authentication certificate not found!
E [08/Jun/2008:09:49:34 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:09:52:34 +0200] PID 6588 (/usr/lib/cups/filter/pstoraster) stopped with status 255!
E [08/Jun/2008:09:52:35 +0200] [Job 25] Job stopped due to filter errors.
E [08/Jun/2008:09:54:29 +0200] cupsdAuthorize: Local authentication certificate not found!
E [08/Jun/2008:09:54:29 +0200] Resume-Printer: Unauthorized
E [08/Jun/2008:10:00:15 +0200] PID 6603 (/usr/lib/cups/filter/pstoraster) stopped with status 1!
E [08/Jun/2008:10:00:15 +0200] [Job 26] Job stopped due to filter errors.
E [08/Jun/2008:10:03:08 +0200] cupsdAuthorize: Local authentication certificate not found!
E [08/Jun/2008:10:03:08 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:10:10:42 +0200] cupsdAuthorize: Local authentication certificate not found!
E [08/Jun/2008:10:10:42 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:10:29:23 +0200] PID 6699 (/usr/lib/cups/filter/pstoraster) stopped with status 1!
E [08/Jun/2008:10:29:24 +0200] [Job 28] Job stopped due to filter errors.
E [08/Jun/2008:11:06:32 +0200] cupsdAuthorize: Local authentication certificate not found!
E [08/Jun/2008:11:06:32 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:11:18:14 +0200] DNSServiceRegister failed with error -65537
E [08/Jun/2008:11:19:27 +0200] Pause-Printer: Unauthorized
E [08/Jun/2008:11:19:57 +0200] DNSServiceRegister failed with error -65537
E [08/Jun/2008:13:32:32 +0200] Resume-Printer: Unauthorized
E [08/Jun/2008:14:05:03 +0200] PID 6826 (/usr/lib/cups/filter/pstoraster) stopped with status 1!
E [08/Jun/2008:14:05:03 +0200] [Job 29] Job stopped due to filter errors.
E [08/Jun/2008:14:05:31 +0200] Pause-Printer: Unauthorized
-------------------
Bernd