@ anima d'amore;;
What you've listed are all glitches that unfortunately cannot be fixed by anyone on staff but Dujo. Everyone that is active onsite has gotten the "dummy / empty" messages in their inbox and you just have to wait and try again to delete them. Same for loading time; it's not a browser issue, it's Mibba's server / host "freaking out" and being slow. Which is why sometimes it is able to load faster if, for example, there are less users online at certain times of the day (e.g. when it's twelve to three AM-ish where I live, most American Mibba users are sleeping and the site runs a bit faster since there is less traffic).
We all have been dealing with it, especially with the recent waves of spambots trying to post their spam in various areas of the site.
As I stated before, we just need to be patient and try to remain as such in the meantime.