Error 500, internal server error and images not showing on rc 1.02

[guisasso]

Hello, the following errors first happened after upgrading my installation from 1.0.1 to 1.0.2, the, after a clean install on a different directory, errors still occur.

A couple of odd things:
Even though I get error messages 500 sometimes, server logs show no errors.
Errors seem to happen more in one computer than other.
Errors don't happen all the time.

As a test this morning, I kept opening a message with 5 images attached on rc 0.9.5 and on 1.0.2. On the older version, the thumbnails appear every time, no issues. On the newer installation, every time the message is open, 2 or 3 of the thumbnails don't show, and it is not the same images, it changes every time the message is open.

Any idea? My first thought was this was obviously an error on the server, but since it doesn't appear on the logs, it's just weird.
I'm thinking maybe the error 500 for example could actually not be happening and the message is just being displayed erroneously.
Thank you,

[SKaero]

A 500 is a server and should be logged somewhere.

[guisasso]

Just as an update, the same email message, at the same time, being opened on both 0.9.5 and 1.0.2 could be opened with 0.9.5 and gave me a error 500 on 1.0.2. Repeatedly.