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Do you know an exact way to reproduce it? Never happened to me so far.

You can also just update the text on "trigger update".

The thing I did with the SetText-Function inside the trigger is actually really bad practice. It's a quick way, but kinda dirty on the other...

Is there a difference in using UNIT_SPELLCAST_START/STOP/... and using a trigger that is just set to Status->Cast?

The easiest way would be to check for the string length of the target name. This can be achieved by prefixing the variable with a Hashtag (#), e.g. if #abc > 0 then <has a target> else <no target >...

What's the struggle?

What you can do is strip the WeakAuras... line, remove the local from the casttarget variable and use it in a custom text function, e.g.: function() return casttarget end
The variables offered by...

Nope. But it's not so difficult to make.

On your progress bar: Set "Left Text" (Display) to %c

Then add a Trigger.
Type: Custom
Event Type: Event
Event(s): UNIT_SPELLCAST_SENT
And add the...

Well, in case you need some help, here is what I quickly made to test it:
...

http://wowprogramming.com/docs/events/UNIT_SPELLCAST_SENT

I just did a quick test and it's working like a charm.