diff -up cups-1.4rc1/scheduler/job.c.filter-debug cups-1.4rc1/scheduler/job.c

--- cups-1.4rc1/scheduler/job.c.filter-debug	2009-06-23 18:10:57.125572911 +0100

+++ cups-1.4rc1/scheduler/job.c	2009-06-23 18:11:31.495572481 +0100

@@ -544,10 +544,28 @@ cupsdContinueJob(cupsd_job_t *job)	/* I 

     if (!filters)

     {

+      mime_filter_t *current;

+

       cupsdLogJob(job, CUPSD_LOG_ERROR,

 		  "Unable to convert file %d to printable format!",

 		  job->current_file);

+      cupsdLogJob(job, CUPSD_LOG_ERROR,

+		  "Required: %s/%s -> %s/%s",

+		  job->filetypes[job->current_file]->super,

+		  job->filetypes[job->current_file]->type,

+		  job->printer->filetype->super,

+		  job->printer->filetype->type);

+

+      for (current = (mime_filter_t *)cupsArrayFirst(MimeDatabase->srcs);

+	   current;

+	   current = (mime_filter_t *)cupsArrayNext(MimeDatabase->srcs))

+	  cupsdLogJob(job, CUPSD_LOG_ERROR,

+		      "Available: %s/%s -> %s/%s (%s)",

+		      current->src->super, current->src->type,

+		      current->dst->super, current->dst->type,

+		      current->filter);

+

       abort_message = "Aborting job because it cannot be printed.";

       abort_state   = IPP_JOB_ABORTED;