By the way, even if setting mclk and vddci at fixed values, it eventually
freezes. It takes longer though. It will happen when scrolling a window or
focusing on a new one. Problem is, I can't seem to get any message when it
happens.

The more I look at it, the more I think it is freezing somewhere that has
nothing to do with the mclk or vddci values. It could be a race condition or we
could be trying to use something that was already released. A register or an
uninitialized variable maybe. What do you think?