Suspicious activities/Problems in blogs- report it here & request for solution

Every regular bloggers must have experienced some kind of suspicious acitivity in their blogs, like posts getting disappeared, comments not becoming visible, surge in spam comments, images not appearing in posts etc.

Today I had one such incident and thought of searching indiblogger to find whether anyone has reported such an incident. But what I found is that all the problems are reported in different threads and finding the right one is little bit difficult. So started this thread which can be a repository of such problems. If a thread for any of the problems reported here exists, then we can give a link to that thread here.

The knowledge of indibloggers regarding solution to such problems can get shared here.