First I should say that I'm sorry if the question is too much broadly scoped, but I was not able to produce a MWE with this bug.
My trouble is that I'm writing my PhD thesis in LaTeX (which I've used exclusively for almost a decade now), with the template required by the institution (a package not on CTAN).
I did some light tweaking in the package, for it to work with XeTeX. The trouble is that, every time the character 'u' is capitalized (like in a title, heading or citation), a 'V' is produced, instead of a 'U'.
Is anyone aware of any incompatibility that may produce such results?
Thank you, for any input.