Now I can definitely say I am getting this bug:
when I cast nano, no progress bar appears, neither I get the casting animation.
Only system messages.
Extremely annoying for a doc, especially when you cast DoT's.
I recall it happening before, but it was rare. Now like 1/4 - 1/3 of my nanos cast like that.
Unfortunately, I can't say for sure when it started, but it was one of 16.3 patches.
Anyone has similar problems ?