Hi Jim,
I will try to help here.
It seems to me your C2T-Data backup job is reading from disk and writing to tape.
The disk autochanger used by this job gor reading is "FileChgr" and it has three devices each having a different media type (DailyDisk, WeeklyDisk and MontlhyDisk).
In this case, only one drive will be able to use "DailyDisk" media types.
Since jobid=934 is using the DailyDevice for reading, you do not have any other device to use for writing DaikyDisk medias and this is why jobids=936-939 are waiting.
Please note this kind of disk autochanger configuration is not recommended. Instead, all drives configured for one disk autochanger should use the same media type.
I would recommend you to review your current settings to have one autochanger to deal with only one specific media type.
In your case, you will need at least one drive to be used by the C2T-Data backup job for reading and another drive to be used by any other backup job for writing.
Hope this helps.
Best,
Ana