Just noting that, depending on what you want to achieve, you may be able to use the threading functionality so that a "new" entry is actually a "reply" to a previous entry.  This will allow you to populate attributes with values from that previous entry without having to rely on storing information outside the system, with all the attendant concurrency risks already identified.

Recently I fixed some issues with MOptions. Please update to version 2.7.5.

 Many thanks, the latest version addresses this problem.

> Is is possible to postdate the Entry Date for an entry?
> 
> The documentation lists the ability to forward date an entry, but I don't 
> see any ability to backdate an entry (edit the date to a date in the past).
> 
> Given that the entry date is part of the logbook entry file structure, it 
> wasn't obvious how to make this change.

The date is part of the logbook entry file structure because it's considered 
as a "stamp" which cannot be changed, so to document the real date when the 
message was written. In some installations this is very important.

If you need to change the date more freely, I would recommend to add another 
attribute which can be changed at will. Up to now this has to be a string 
variable so users have to make sure to enter the date in proper format, but 
you can prepopulate that with the current date like:

Attributes = Author, ..., Real date
Preset Real date = $date

This way the current date occurs in that field, but can be changed 
(backdated).

Note that the entry date can be changed directly in the YYMMDDa.log files in 
the data directory, if one has write access there and the elogd daemon is not 
running.

> At some point, in the last week or so, I upgraded the debian-unstable
> version (r1459-1) of elog.  Now, PostScript files (as attachments) are
> displayed (shown in ascii text, instead of just showing the link).  
> 
> Is there an option in the elog.cfg to only display certain files (like .gif
> or .jpg).

See elog:691 . In the latest CVS version, postscript files are not displayed
any more inline, but the next debian release will take some time, maybe you can
compile from source...

When you log in manually to a logbook, a session ID is created and stored in a cookie "sid". On your shift check list you need some code to copy this session ID into your current form. In the code form 2010, I used "unm" and "upwd", but this was removed since it's not safe. So now you need somethign like:

<input type="hidden" name="sid" id="sid">

and

document.getElementById('sid').value = get_cookie('sid');

in your init code.

I haven't tried that in the past 12 years so no guarantee that it should work.

Stefan