I am using eLog ELOG V2.6.1-1681 which has 7 log books under 8 categories. Out of 7 log books, 2 are daily used. It happened that two weeks back. I modified information on two log books which were not used for quite longtime. Hence using CONFIG, I updated these log books, changing text etc. After that eLog in general started giving error. Any time when we click SUBMIT button in any log book, eLog shows page not found. That submit crashes eLog and as a result elogd service stops. Restarting elogd service, eLog operation comes back and the log which I submitted was actualy saved. Difficulty is that this problem is happening with every single submit action. 

I searched forum and learnt that upgrading eLog to newest version 2.7.8 will solve this problem. Upgrade created more problems, I was not able to open any log, authentication was not accepted. I restored that backup and went back to previous version. eLog started working but with submit error.

If any one can help me in fixing this problem

I propose that you get 2.7.8 working. If the authentication fails, try do do password recovery, or recreated the accounts. 

 Thanks for the reply. I found problem with existing version. I opened log book group  without  opening log book details in configuration, that is why at submitting or opening elog was not able to find log book for that group and was getting lost.

Regarding moving to 2.7.8, I want to know that in this new version file location for pwd and log books will remain same or are changed. If changed then I have to change location manually. Also how I can perform password recovery.

Options Completed = Open{a}, Closed{b}
{a} Preset CompletedDate = 
{b} Preset CompletedDate = $date