Now some may say the definition of 'crazy' is doing the same thing over and over while expecting a different result. Here's one crazy thing I did: updated eOS (Loki, I guess) via the store and caused my system to fail in consequence. Then I reinstalled eOS, udated again: same result.
What happens: first, the system takes significantly longer to boot, next comes the login screen (after 3-4 minutes, I guess) and then comes a very, very slow login loop. I tried different users: no avail. Reinstalled lightdm, checked permissions on user accounts: same result.
I'm on a very old Macbook 2,1 with a Core2duo and 4GB RAM.
Will probably reinstall the OS later this day and NOT upgrade. Anybody with a better solution / experience / what ever might be of any use?
P.S. Please don't tell me to upgrade my hardware: not wanting to is why I use a lightweight Linux OS ;) Also, I'm not much of a Linux expert, not a newbie either though. I know my way around the terminal and stuff.