I'' struggling to open a PM in my inbox, usually tapping on the subject line will open it, but this particular PM has a blank subject and I can't find another way of opening it,

Thanks for pointing that out!

I've added a default subject line, "(No subject)", which should solve the issue for now. Technically it is still possible for someone to remove the subject line before hitting send, making the message unreadable. Unfortunately right now I'm kinda swamped (making preparations for grandma's birthday, who's turning 91 tomorrow!), but I promise I'll take a look at it asap .