So, probably one or more changes in either

upstart
system-services
hildon-desktop

are the culprit?

EDIT: hildon-desktop 2.2.147.90-1 update didn't change this behavior. I would attached a (partial) syslog, but currently:

MicroB, claws-mail and so on all crash. (It could be HTML-view / control related, though.) At least they worked before that last update.
Opera can't load my DAV-Account website via HTTPS (only that is possible) because of the common & famous encryption-layer related "fatal error (40)", that you can't override.
Helium wouldn't give me a damn file chooser dialogue for HTTP upload ANYWHERE.
Dooble browser wasn't able to start since i installed it.
BT file transfer isn't possible too, because of issues mentioned in <see obexd thread>.
xarchiver couldn't create a .7z archive because it complains about "too many levels of symbolic links", but at least it let me 'zip the d*mn log up.

I 'ate this... it's the pure N900 experience; there are _always_ things which are broken but you rely on because they are, like, basic functionality?. Ok, then scrap that; i have no more time for this today.