'last seen 'for whatsapp contact not showing anymore?Am I being blocked? Is there any reason that I am not able to see a whatsapp contact's last seen time anymore?Such as some kind of bug but not being blocked?
It all depends on which version of WhatsApp you currently operate


In the previous versions of WhatsApp you had to block a specified
user in order to avoid your last seen, display picture be seen from
an annoying person.
If you have been blocked by a person then after few days you will
not be able to view their dp as well as last seen.
In the latest version(s) WhatsApp provides more privacy
settings. These are available via Settings > Account > Privacy (in both Android and iOS).
Hide display picture-If you select this option then urs as well as
other display picture will be hidden (i.e your dp will be hidden from others as
well as you cannot view other's dp as well).
Hide last seen-If you select this option then your last seen will
not be visible to anyone as well as you cannot see other's last seen.
How ever if you are not sure then better wait for few days(1-2)
after which you can yourself identify whether you have been blocked
by some person or its your settings.