The only events I have at the moment are masquerade notifications. I haven't received alerts that I've set for anything for a few days now, I think... Including training, zapper, bonding with minions. There may be other alerts not coming through, but those are the ones that come to mind right now.

EDIT: Achievements are also not coming up on the events sidebar

yes, had those too + for the last few days games (like random, mallarcy pound or reflection) are not coming through either. Training updates have been lacking for at least 1-2 months, btw.