I have noticed that documents appear to lose information after a computer crash (or restart) even if the autosave feature is on. I suspect manual save may always works, but the autosave setting appears not to have any effect (I will set up a document to test whether manual save does always work or whether it is the same as autosave) in these circumstances.
Not a problem if the program is closed properly.

I had expected that everything would be saved up to the latest autosave even if a computer crash meant that the program was not closed properly.
I assume that this will be a database effect that affects all areas.

I can confirm that the problem exists. Doesn't seem to be a problem if saved manually, and I'm not sure it always is on autosave (my test docs seemed to be still there). Maybe it is an issue only with open docs or with docs that are open in their own window.
Lost some stuff on the last crash which had been there for over 12 hours.
I've not experienced any autosave problems with other programs.
The 'crashes' are of the system freezing and having to be restarted.

Brilliant! Really glad you've managed to pin it down.

I have created two DoogiePIM databases (I have upgraded regularly from version 1.x to the current version 2.x). I use one or both databases on a daily basis. I have been experiencing three problems with the software in increasing frequency. One of the problems arose this week for the first time. Two documents in one database and another in the other database are no longer present. The document titles are still present in the navigation pane. The corresponding pages are blank! These were large documents, many pages long, that represented quite a bit of work.

Unlike the other posts reported here, the disappearance of these documents did not follow a computer crash or an unusual shutdown of the program or the computer. I became aware of the absence of the contents of the documents upon opening the program. Three times in less than one week. This is alarming.

Is it just a matter of time before documents in the Journal section get wiped out as well? I am suspending use of DoogiePIM for the time being. I will report the other two problems elsewhere. I suspect that other users are experiencing them as well.

Thanks for the prompt replies. I use a Lenovo ThinkPad T460 purchased in August 2016. It runs Windows 10 Home edition, version 1803 installed on June 6, 2018. I purchased DoogiePIM on September 20, 2016. It is installed on the hard drive in the directory chosen by DoogiePIM during installation. I did not transfer any .DO3 file to DoogiePIM. I have been using the program extensively since then. I have kept up with the program upgrades in a timely fashion, never skipping one.

I created two databases shortly after the purchase of the application. I will refer to them as home (presently 12.0 MB in size) and media (5.7 MB). I want to point out their respective companion .doosi files because I do not know their function. Moreover, I am surprised by the size of media.doosi (23.8 MB) as compared to the media.doo file size cited above and the home.doosi file size (a mere 8.9 MB).

Two of the now-blank documents are present in the most recent backup files (October and September) One was created in March 2018 and the other some time earlier. A third now-blank document is absent from recent backups though it was present in the database as recently as last weekend!

By the way, I have relied exclusively on the auto-save feature for the documents and the journal entries. I have never used the Ctrl+S command to initiate a manual save. Finally, I subscribe to Norton Internet 360 which installs anti-virus definitions and other features automatically.

I trust this will give you leads in your elucidation of the problem.

Thank you for the reply and suggestions. I create backups of single documents on an irregular basis. I save them as RTF files on a different disk. The format is more versatile than the DON format as I can open the documents in a word processor such as Microsoft Word. Saving single documents in DON format would be a good way to have a readily available backup should this happen again. I also back up the entire databases at least once a week, sometimes as often as three times. Clearly, this could be done daily using the backup feature built into the PIM.

I understand that you have had great success with the Avast AV product. Why do you propose the dismissal of the Norton AV product? Are you suggesting that it may be responsible for the incessant "DoogiePIM is not responding" messages that I experience?

I appreciate that having a backup available would allow recovery of an unexplained document disappearance as I described above. I am still puzzled by the sudden disappearance of these documents. as there is no explanation for this behavior as of yet. I assure you that I did not delete the documents after keying in the Ctrl+A sequence.

I will continue to monitor the performance of the PIM and inform you of changes.

Quite a few reasons not to use Norton. Avast is OK. I used Outpost at one time; when it was taken over by Kaspersky, I decided to decline the free year of Kaspersky because I had lost confidence in its privacy (too many Russian internet attacks; nothing to do with Kaspersky, but I preferred to stay well away). Decided to go with Bitdefender. Haven't regretted it; not intrusive & doesn't seem to slow my system. Used Avast many years ago, and think it is a good free option - but then Windows Defender isn't that bad now either.

Yet another document has disappeared! it was present when I closed the database earlier this evening. I worked in my other DoogiePIM database for about five hours, closed it and opened the previous database. The document was gone. I imported the .DON version of that document which I had created as a backup. Shuttling .DON documents back and forth is not a promising future.