[no daily reward for cantha event completion]

Same problem for me, did 2 different events and got chests both times, but no completion of the WV.

Anet needs to clarify what type of events count for this and which doesnt, really annoying.

[Straits of Devastation T3 Rifts do not progress 'complete 15 T3 Rift Hunts' Wizard vault special]

Just did a bunch of T3s in sandswept isles and none counted... :(

[Inability to purchase gems due to in-game store]

Yeah they just told me they are "aware of it" and that i should check the website for updates...

[Inability to purchase gems due to in-game store]

Another month gone by and still unable to buy gems :(