Hi there.
I am having an issue with the Trim functions after having upgraded to 7.6.3 over the weekend using the auto update. It is the same issue that was reported in the 7.2.0 beta thread at the time with the String.TrimEnd function not actually returning the trimmed value. This is present in the 'Variables' window examples.
It appears String.TrimChars is also misbehaving.
Please take a look at this.