When opening a file from an external location, in my case via FTP, the file opens correctly and saves correctly when you do that within an amount of time after login into the remote location. But when a certain amount of time has passed (can't exactly tell how much time because I don't keep track of that), and when I save the file remotely, LibreOffice hangs. This is also the case when you try to open another file remotely stored on this FTP location.
In the case of Windows 10, I get a "error while saving the document" and a "General input/output error" message. When you close this message, you'll be able to continue to work with LibreOffice, but when to try opening a remotely stored file again it ends with the same error message. A workaround is to close LibreOffice entirely, start the program and open the remotely stored document once again.
On various Linux distro's I encounter the exact same problem. The only difference is that I don't get an error message, but LibreOffice freezes and does nothing anymore. The only thing I can do is to force LibreOffice to quit.
Steps to Reproduce:
1. Open LibreOffice
2. Open an remotely saved document with the FTP-protocol
3. Do the normal routine by logging into the remote storage and select the desired document (every compatible document will do)
4. Work on your document for a while and try to save it on the same location where the document is stored
Under Windows 10: It shows an "error while saving the document" and a "General input/output error" message. You can continue working with LibreOffice, except when you try to reopen the remotely stored document once again.
On Linux (Ubuntu 16.04 LTS, Xubuntu 18.04 LTS, Manjaro 18.0.4) the same routine earlier described results in a freezed LibreOffice. The only way to undo this is to force to quit the program and to start it again.
When the remote login time has expired, LibreOffice should ask once again for a password to log in and to open/store the document.
User Profile Reset: Yes
I encountered this problem on different machines, on different Linux distros and on Windows 10, using LibreOffice 220.127.116.11 (Windows 10, Ubuntu 16.04 LTS and Xubuntu 18.04 LTS) and LibreOffice 18.104.22.168 on Manjaro 18.0.4.
Created attachment 154024 [details]
The shown error message (in this case in Dutch), but it says: "Error while saving document [NAME DOCUMENT]. General input/output error".
Considering the number of bugs, Firebird migration is no more proposed from future 6.3.2, unless you enable experimental mode.
Julien, I don't see how this bug is related to Base/Firebird.